2005 Kia Optima Ignition Parts

Engine:

Showing parts for every engine. Select an engine to see only what fits.

129 Ignition parts are listed for the 2005 Kia Optima, in 10 part types, covering both the 2.4L L4 and the 2.7L V6. Each one has a brand, a manufacturer part number and notes that say where it fits.

The ignition system on the 2005 Kia Optima delivers spark at the right moment — plugs, coils, wires, distributors and ignition modules. The largest groups are Spark Plug (26 parts), Ignition Coil (23 parts) and Camshaft Position Sensor (22 parts). The other 7 part types cover the remaining 58 parts.

Camshaft Position Sensor

Economy

Brand Part Number Markets Notes Buy
BWD/NIEHOFF Popular Fits: 2.4L L4 CSS1564
🇺🇸 US 🇨🇦 CA
Cam position sensor
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FAMOUS BRAND Popular Fits: 2.4L L4 CSC1247
🇺🇸 US 🇨🇦 CA
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ULTRA-POWER Popular Fits: 2.4L L4 5S1301
🇺🇸 US 🇨🇦 CA
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HOLSTEIN Fits: 2.4L L4 2CAM0003
🇺🇸 US
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PRENCO Fits: 2.4L L4 4E1071
🇺🇸 US 🇨🇦 CA
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SKP Fits: 2.4L L4 SK907712
🇺🇸 US
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STANDARD MOTOR PRODUCTS Fits: 2.4L L4 PC373T
🇺🇸 US
T-Series
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STANDARD MOTOR PRODUCTS Fits: 2.4L L4 CSS1564
🇺🇸 US 🇨🇦 CA
Cam position sensor
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UNITED MOTOR PRODUCTS Fits: 2.4L L4 CAM100
🇺🇸 US
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VEMO Fits: 2.4L L4 V95720018
🇺🇸 US
Plug (Connector): 3 Pins
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Full Service Kit

Brand Part Number Markets Notes Buy
WALKER PRODUCTS Popular Fits: 2.4L L4 23591051
🇺🇸 US
Full Service Kit
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Standard Replacement

Brand Part Number Markets Notes Buy
HYUNDAI Popular Fits: 2.4L L4 3931038050
🇺🇸 US
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ASTEMO / HITACHI Fits: 2.4L L4 CPS0274
🇺🇸 US
Mount Hole Quantity: 1
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BECK/ARNLEY Fits: 2.4L L4 1800350
🇺🇸 US
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DELPHI Fits: 2.4L L4 SS11354
🇺🇸 US
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FACET Fits: 2.4L L4 90335
🇺🇸 US
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HELLA Fits: 2.4L L4 009121801
🇺🇸 US
3-Pin Connectorwith Seal
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HL MANDO Fits: 2.4L L4 22A1009
🇺🇸 US
New
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NTK Fits: 2.4L L4 EC0144
🇺🇸 US
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STANDARD MOTOR PRODUCTS Fits: 2.4L L4 PC373
🇺🇸 US
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WALKER PRODUCTS Fits: 2.4L L4 2351051
🇺🇸 US
Sensor Only
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WELLS Fits: 2.4L L4 5S1301
🇺🇸 US
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This table covers the sensors that report camshaft position to the ECU. Typical signs include a stall, a no-start, or a code for cam or crank correlation. Check the connector and the reluctor gap before replacing the sensor.

Camshaft Position Sensor Interrupter

Brand Part Number Markets Notes Buy
WELLS Fits: 2.4L L4 5S16351
🇺🇸 US
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This table covers the interrupter wheels the camshaft sensor reads.

Crankshaft Position Sensor

Economy

Brand Part Number Markets Notes Buy
FAMOUS BRAND Popular Fits: 2.4L L4 180208804
🇺🇸 US 🇨🇦 CA
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SPECTRA PREMIUM Popular Fits: 2.4L L4 S10041
🇺🇸 US
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STANDARD MOTOR PRODUCTS Popular Fits: 2.4L L4 PC374T
🇺🇸 US
T-Series
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BWD/NIEHOFF Fits: 2.4L L4 CSS732
🇺🇸 US 🇨🇦 CA
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FAMOUS BRAND Fits: 2.4L L4 CSC1189
🇺🇸 US 🇨🇦 CA
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HOLSTEIN Fits: 2.4L L4 2CRK0568
🇺🇸 US
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PACE SETTER ELECTRICAL Fits: 2.4L L4 CSS732Z
🇺🇸 US 🇨🇦 CA
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PRENCO Fits: 2.4L L4 4D1002
🇺🇸 US 🇨🇦 CA
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SKP Fits: 2.4L L4 SK907756
🇺🇸 US
Crankshaft Angle Sensor
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ULTRA-POWER Fits: 2.4L L4 5S1773
🇺🇸 US 🇨🇦 CA
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UNITED MOTOR PRODUCTS Fits: 2.4L L4 CRK175
🇺🇸 US
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VEMO Fits: 2.4L L4 V52720033
🇺🇸 US
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Full Service Kit

Brand Part Number Markets Notes Buy
WALKER PRODUCTS Fits: 2.4L L4 23591257
🇺🇸 US
Full Service Kit
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Standard Replacement

Brand Part Number Markets Notes Buy
STANDARD MOTOR PRODUCTS Popular Fits: 2.4L L4 PC374
🇺🇸 US
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BECK/ARNLEY Fits: 2.4L L4 1800336
🇺🇸 US
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DELPHI Fits: 2.4L L4 SS11089
🇺🇸 US
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HYUNDAI Fits: 2.4L L4 3931038060
🇺🇸 US
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NTK Fits: 2.4L L4 EH0219
🇺🇸 US
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WALKER PRODUCTS Fits: 2.4L L4 2351257
🇺🇸 US
Sensor Only
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WELLS Fits: 2.4L L4 5S1773
🇺🇸 US
Wiring Harness Length: 33.50 In
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This table covers the sensors that report crankshaft position and engine speed. Typical signs include a stall, a no-start, or a code for cam or crank correlation. Check the connector and the reluctor gap before replacing the sensor.

Crankshaft Position Sensor Blade

Brand Part Number Markets Notes Buy
DORMAN Fits: 2.4L L4 917028
🇺🇸 US
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HYUNDAI Fits: 2.4L L4 2335538010
🇺🇸 US 🇨🇦 CA
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This table covers the Crankshaft Position Sensor blades. Typical signs include chatter, streaks, or a skip at the top of the stroke. Confirm left and right lengths in the notes — they are often different.

Ignition Coil

Economy

Brand Part Number Markets Notes Buy
SKP Popular Fits: 2.4L L4 SKUF285T
🇺🇸 US
Coil on Plug
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SPECTRA PREMIUM Popular Fits: 2.4L L4 C602
🇺🇸 US
Ignition Coil Mounts to Cylinder Head
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ULTRA-POWER Popular Fits: 2.4L L4 5C1155
🇺🇸 US 🇨🇦 CA
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B&B Fits: 2.4L L4 BB2285
🇺🇸 US
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BWD/NIEHOFF Fits: 2.4L L4 E874
🇺🇸 US 🇨🇦 CA
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FAMOUS BRAND Fits: 2.4L L4 EBC1795
🇺🇸 US 🇨🇦 CA
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FAMOUS BRAND Fits: 2.4L L4 26C1074
🇺🇸 US 🇨🇦 CA
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FVP Fits: 2.4L L4 UF285F
🇺🇸 US
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HOLSTEIN Fits: 2.4L L4 2IGC0213
🇺🇸 US
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PRENCO Fits: 2.4L L4 368078
🇺🇸 US 🇨🇦 CA
Includes 36-2041 Boot Kit
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STANDARD MOTOR PRODUCTS Fits: 2.4L L4 UF285T
🇺🇸 US
T-Series
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STANDARD MOTOR PRODUCTS Fits: 2.4L L4 E874
🇺🇸 US 🇨🇦 CA
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WAI GLOBAL Fits: 2.4L L4 CUF285
🇺🇸 US
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Full Service Kit

Brand Part Number Markets Notes Buy
WALKER PRODUCTS Fits: 2.4L L4 92192018
🇺🇸 US
Full Service Kit
Fitment notes — WALKER PRODUCTS 92192018
Full Service Kit
Cylinder 2,4
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Premium

Brand Part Number Markets Notes Buy
ASTEMO / HITACHI Fits: 2.4L L4 IGC0134
🇺🇸 US
Coil On Plug IgnitionCoil Type: Pack
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DELPHI Fits: 2.4L L4 GN10303
🇺🇸 US
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Standard Replacement

Brand Part Number Markets Notes Buy
DENSO Popular Fits: 2.4L L4 6738205
🇺🇸 US
Direct Ignition Coil or Coil On Plug
Fitment notes — DENSO 6738205
Direct Ignition Coil or Coil On Plug
Cylinder 2 & 4Original Equipment Part
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WALKER PRODUCTS Popular Fits: 2.4L L4 9212018
🇺🇸 US
Single Coil
Fitment notes — WALKER PRODUCTS 9212018
Single Coil
Cylinder 2,4
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HL MANDO Fits: 2.4L L4 21A0119
🇺🇸 US
New
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NGK Fits: 2.4L L4 48649
🇺🇸 US
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STANDARD MOTOR PRODUCTS Fits: 2.4L L4 UF285
🇺🇸 US
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UNITED MOTOR PRODUCTS Fits: 2.4L L4 COP239
🇺🇸 US
Mounting Bracket Included: No
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WELLS Fits: 2.4L L4 5C1155
🇺🇸 US
Requires External Resistor: YES
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This table covers the coils that fire each spark plug. Typical signs include a misfire that follows one cylinder, a snap in damp weather, or a coil that is swollen or cracked. Swap a suspect coil with a neighbor to confirm, then replace boots that tore on the way off.

Ignition Misfire Sensor

Brand Part Number Markets Notes Buy
DORMAN Fits: 2.4L L4 907804
🇺🇸 US
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MOTORAD Fits: 2.4L L4 1KR383
🇺🇸 US
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STANDARD MOTOR PRODUCTS Fits: 2.4L L4 PC544T
🇺🇸 US
T-Series
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STANDARD MOTOR PRODUCTS Fits: 2.4L L4 PC544
🇺🇸 US
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This table covers the Ignition Misfire sensors. Typical signs include a warning lamp, a stored code, or a reading that drops out when the harness is wiggled. Inspect the connector and ground before replacing the sensor — wiring faults are often condemned as bad sensors.

Spark Plug

Summary: Notes include pre-set gaps of 0.032", 0.035", 0.040", 0.041", 0.043", 0.044", 0.045", 0.05", 0.054" and 0.063". Replacement brands in this table include CHAMPION, NGK and DENSO.

Copper / Nickel

Brand Part Number Markets Notes Buy
ACDELCO Popular Fits: 2.4L L4 41629
🇺🇸 US 🇨🇦 CA
ProfessionalConventional
Fitment notes — ACDELCO 41629
ProfessionalConventionalPre-Set Gap: 0.035"
Original Equipment-Recommended Gap: .044
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CHAMPION Popular Fits: 2.4L L4 322
🇺🇸 US
Copper PlusPre-Set Gap: 0.041"
Fitment notes — CHAMPION 322
Copper PlusPre-Set Gap: 0.041"
OE-Recommended Gap: 0.044"
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NGK Popular Fits: 2.4L L4 6937
🇺🇸 US
V-PowerPre-Set Gap: 0.044"
Fitment notes — NGK 6937
V-PowerPre-Set Gap: 0.044"
OE-Recommended Gap: 0.044 in
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NGK Popular Fits: 2.4L L4 7634
🇺🇸 US
StandardPre-Set Gap: 0.044"
Fitment notes — NGK 7634
StandardPre-Set Gap: 0.044"
OE-Recommended Gap: 0.044 in
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CHAMPION Fits: 2.4L L4 3221
🇺🇸 US
Copper Plus
Fitment notes — CHAMPION 3221
Copper Plus
OE-Recommended Gap: 0.044"
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DENSO Fits: 2.4L L4 3201
🇺🇸 US
U-Groove ConventionalPre-Set Gap: 0.044"
Fitment notes — DENSO 3201
U-Groove ConventionalPre-Set Gap: 0.044"
Gap .044
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MOTORCRAFT Fits: 2.4L L4 SP467
🇺🇸 US 🇨🇦 CA
.044 Gap
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Double Platinum (lasts up to 3x longer than Copper / Nickel)

Brand Part Number Markets Notes Buy
ACDELCO Fits: 2.4L L4 41802
🇺🇸 US 🇨🇦 CA
ProfessionalDouble Platinum
Fitment notes — ACDELCO 41802
ProfessionalDouble PlatinumPre-Set Gap: 0.045"
OE-Recommended Gap: 0.044" (IN)
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CHAMPION Fits: 2.4L L4 7322
🇺🇸 US
Double Platinum PowerPre-Set Gap: 0.032"
Fitment notes — CHAMPION 7322
Double Platinum PowerPre-Set Gap: 0.032"
OE-Recommended Gap: 0.044"
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DENSO Fits: 2.4L L4 3114
🇺🇸 US
Double PlatinumPre-Set Gap: 0.044"
Fitment notes — DENSO 3114
Double PlatinumPre-Set Gap: 0.044"
Gap .044
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MOTORCRAFT Fits: 2.4L L4 SP485
🇺🇸 US
Double Platinum
Fitment notes — MOTORCRAFT SP485
Double Platinum
OE Style.044"/1.1mm
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NGK Fits: 2.4L L4 5760
🇺🇸 US
Laser PlatinumPre-Set Gap: 0.044"
Fitment notes — NGK 5760
Laser PlatinumPre-Set Gap: 0.044"
OE-Recommended Gap: 0.044 in
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Iridium (lasts up to 4x longer than Copper / Nickel)

Brand Part Number Markets Notes Buy
SKP Popular Fits: 2.4L L4 SP1013
🇺🇸 US
Iridium XP
Fitment notes — SKP SP1013
Iridium XP
Gap 0.043 (In)
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AUTOLITE Fits: 2.4L L4 XP3924
🇺🇸 US
Iridium XP Spark Plug Dual Display PackPre-Set Gap: 0.044"
Fitment notes — AUTOLITE XP3924
Iridium XP Spark Plug Dual Display PackPre-Set Gap: 0.044"
Gap .043 (In) 1.1 (mm)
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CHAMPION Fits: 2.4L L4 9007
🇺🇸 US
IridiumPre-Set Gap: 0.054"
Fitment notes — CHAMPION 9007
IridiumPre-Set Gap: 0.054"
OE-Recommended Gap: 0.044"
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DENSO Fits: 2.4L L4 5305
🇺🇸 US
Iridium PowerHex Size: 20.6 mm
Fitment notes — DENSO 5305
Iridium PowerHex Size: 20.6 mmPre-Set Gap: 0.044"
Gap .044
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DENSO Fits: 2.4L L4 4708
🇺🇸 US
Iridium TTHex Size: 20.6 mm
Fitment notes — DENSO 4708
Iridium TTHex Size: 20.6 mmPre-Set Gap: 0.040"
Gap .040
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NGK Fits: 2.4L L4 2115
🇺🇸 US
Iridium IXPre-Set Gap: 0.044"
Fitment notes — NGK 2115
Iridium IXPre-Set Gap: 0.044"
OE-Recommended Gap: 0.044 in
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Platinum (lasts up to 2x longer than Copper / Nickel)

Brand Part Number Markets Notes Buy
NGK Popular Fits: 2.4L L4 7082
🇺🇸 US
G-PowerPre-Set Gap: 0.040"
Fitment notes — NGK 7082
G-PowerPre-Set Gap: 0.040"
OE-Recommended Gap: 0.044 in
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BOSCH Fits: 2.4L L4 6736
🇺🇸 US
OE Fine Wire PlatinumPre-Set Gap: 0.035"
Fitment notes — BOSCH 6736
OE Fine Wire PlatinumPre-Set Gap: 0.035"Terminal Cap is Non-Removable
Original Equipment is Platinum
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BOSCH Fits: 2.4L L4 4478
🇺🇸 US
PLATINUM+4Pre-Set Gap: 0.063"
Fitment notes — BOSCH 4478
PLATINUM+4Pre-Set Gap: 0.063"
Original Equipment is Platinum
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BOSCH Fits: 2.4L L4 4506
🇺🇸 US
PLATINUM IR FUSIONPre-Set Gap: 0.063"
Fitment notes — BOSCH 4506
PLATINUM IR FUSIONPre-Set Gap: 0.063"
Original Equipment is Platinum
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CHAMPION Fits: 2.4L L4 3031
🇺🇸 US
Platinum PowerPre-Set Gap: 0.05"
Fitment notes — CHAMPION 3031
Platinum PowerPre-Set Gap: 0.05"
OE-Recommended Gap: 0.044"
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DENSO Fits: 2.4L L4 4501
🇺🇸 US
Platinum TTTerminal Cap is Non-Removable
Fitment notes — DENSO 4501
Platinum TTTerminal Cap is Non-Removable
Gap .040
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MOTORCRAFT Fits: 2.4L L4 SP497X
🇺🇸 US
Platinum Spark PlugPlatinum
Fitment notes — MOTORCRAFT SP497X
Platinum Spark PlugPlatinumGround Electrode Tip Material: Nickel
.044"/1.1mm
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MOTORCRAFT Fits: 2.4L L4 SP485X
🇺🇸 US
Platinum Spark PlugPlatinum
Fitment notes — MOTORCRAFT SP485X
Platinum Spark PlugPlatinumGround Electrode Tip Material: Platinum
OE Style.044"/1.1mm
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This table covers the spark plugs for this engine. Typical signs include misfire under load, rough idle, or a flashing check-engine light. Verify the gap even on pre-gapped plugs, and replace coil boots that come off a high-mileage engine.

Spark Plug / Ignition Coil Boot

Economy

Brand Part Number Markets Notes Buy
BWD/NIEHOFF Popular Fits: 2.4L L4 SPB127
🇺🇸 US 🇨🇦 CA
with Direct Ignition
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FAMOUS BRAND Popular Fits: 2.4L L4 250010869
🇺🇸 US 🇨🇦 CA
with Direct Ignition
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FAMOUS BRAND Fits: 2.4L L4 357066
🇺🇸 US 🇨🇦 CA
with Direct Ignition
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PRENCO Fits: 2.4L L4 362041
🇺🇸 US 🇨🇦 CA
1.0KI(C), Spring Supplied Loosewith Direct Ignition
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PRENCO Fits: 2.4L L4 36204102
🇺🇸 US 🇨🇦 CA
Ignition Coil Boot KitSet of 2 Boots
Fitment notes — PRENCO 36204102
Ignition Coil Boot KitSet of 2 Bootswith Direct Ignition
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ULTRA-POWER Fits: 2.4L L4 SPP63
🇺🇸 US 🇨🇦 CA
Superseded Multi-Packwith Direct Ignition
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UNITED MOTOR PRODUCTS Fits: 2.4L L4 935S
🇺🇸 US
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WALKER PRODUCTS Fits: 2.4L L4 900P2046
🇺🇸 US
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Standard Replacement

Brand Part Number Markets Notes Buy
NGK Popular Fits: 2.4L L4 58919
🇺🇸 US
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AUTOLITE Fits: 2.4L L4 50032
🇺🇸 US
Professional Series Coil on Plug Boot
Fitment notes — AUTOLITE 50032
Professional Series Coil on Plug Boot
2 Connectors In a Box2 Connectors requiredSlave systemRequires (1) 97074 and (2) 50032 For complete replacement
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BECK/ARNLEY Fits: 2.4L L4 1751037
🇺🇸 US
Multi Coil System
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DENSO Fits: 2.4L L4 6714294
🇺🇸 US
Direct Ignition Coil Boot Kit2 Boots
Fitment notes — DENSO 6714294
Direct Ignition Coil Boot Kit2 Boots
Set
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STANDARD MOTOR PRODUCTS Fits: 2.4L L4 SPP63E
🇺🇸 US
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This table covers the silicone and rubber boots that insulate the coil-to-plug spark path. Typical signs include a misfire in the rain, carbon tracking on the boot, or a snap when you pop the coil off. Replace boots as a set on a high-mileage engine; one cracked boot will take the coil with it.

Spark Plug Tube Seal

Brand Part Number Markets Notes Buy
AUTO 7 Fits: 2.4L L4 6440085
🇺🇸 US
Use With: 644-0019
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HYUNDAI Fits: 2.4L L4 2244338010
🇺🇸 US
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This table covers the seals at the Spark Plug Tube. Typical signs include a wet housing, a drip after sitting, or fluid flung off a rotating shaft. Fix the surface the seal rides on. A new seal on a grooved shaft will leak again.

Spark Plug Wire

Economy

Brand Part Number Markets Notes Buy
STANDARD MOTOR PRODUCTS Popular Fits: 2.4L L4 4683
🇺🇸 US
SetCOP Boots Not Included
Fitment notes — STANDARD MOTOR PRODUCTS 4683
SetCOP Boots Not IncludedFederal Wire
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B&B Fits: 2.4L L4 S428772
🇺🇸 US
Suppressor Wire Set
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FAMOUS BRAND Fits: 2.4L L4 354281
🇺🇸 US 🇨🇦 CA
Set
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STANDARD MOTOR PRODUCTS Fits: 2.4L L4 50278
🇺🇸 US 🇨🇦 CA
COP Boots Not IncludedSet
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Premium

Brand Part Number Markets Notes Buy
NGK Popular Fits: 2.4L L4 3879
🇺🇸 US
Set
Fitment notes — NGK 3879
Set
Set Includes 2 Plug Leads - Other 2 Are Direct Ignition
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DENSO Fits: 2.4L L4 6714248
🇺🇸 US
Spark Plug Wire Set7mm
Fitment notes — DENSO 6714248
Spark Plug Wire Set7mm
Ignition Wire SetApplication Also Requires Coil on Plug Boot Set
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STANDARD MOTOR PRODUCTS Fits: 2.4L L4 7574
🇺🇸 US
Standard® PremiumSet
Fitment notes — STANDARD MOTOR PRODUCTS 7574
Standard® PremiumSetCOP Boots Not IncludedStandard® Premium
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STANDARD MOTOR PRODUCTS Fits: 2.4L L4 55802
🇺🇸 US
IntermotorSet
Fitment notes — STANDARD MOTOR PRODUCTS 55802
IntermotorSetCOP Boots Not Included
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STANDARD MOTOR PRODUCTS Fits: 2.4L L4 55802K
🇺🇸 US
IntermotorSet
Fitment notes — STANDARD MOTOR PRODUCTS 55802K
IntermotorSetIncludes COP Boots
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UNITED MOTOR PRODUCTS Fits: 2.4L L4 9532
🇺🇸 US
United-PackardSet
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UNITED MOTOR PRODUCTS Fits: 2.4L L4 9532BK
🇺🇸 US
United-Packard
Fitment notes — UNITED MOTOR PRODUCTS 9532BK
United-Packard
Wire Set has Only 2 leadsWire and Boot Kit
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Standard Replacement

Brand Part Number Markets Notes Buy
ACDELCO Popular Fits: 2.4L L4 9444J
🇺🇸 US 🇨🇦 CA
GoldSet
Fitment notes — ACDELCO 9444J
GoldSet
Wire set only, does not contain Direct Ignition Coil boots
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STANDARD MOTOR PRODUCTS Popular Fits: 2.4L L4 27574
🇺🇸 US
Pro SeriesSet
Fitment notes — STANDARD MOTOR PRODUCTS 27574
Pro SeriesSetCOP Boots Not Included
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B&B Fits: 2.4L L4 M428772
🇺🇸 US
Platinum Class Laser Mag
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FACET Fits: 2.4L L4 47241
🇺🇸 US
Set
Fitment notes — FACET 47241
Set
Slave
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WALKER PRODUCTS Fits: 2.4L L4 9241891
🇺🇸 US
Direct FitSet
Fitment notes — WALKER PRODUCTS 9241891
Direct FitSetSuppression Core
2 LEAD SET, 2 COP BOOTS REQ'D
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This table covers the Spark Plug wires.

Buying Ignition Parts for a 2005 Kia Optima

On this vehicle, the ignition system delivers spark at the right moment — plugs, coils, wires, distributors and ignition modules.

  • Match the engine first. Every ignition part here is engine-specific; each row shows which engine(s) it fits.
  • Read the notes on each row for position, trim and spec qualifiers before you order.
  • Where labor overlaps, replace plugs and wires (or coil boots) as a set — one weak cylinder makes the whole set feel bad.
  • Cross-reference the manufacturer part number against your old part or a service-manual listing.

Start with the largest groups on this page: Spark Plug and Ignition Coil .

Frequently Asked Questions

How many ignition parts fit the 2005 Kia Optima?

Our catalog currently lists 129 ignition parts for the 2005 Kia Optima across 10 subcategories and 34 brands, covering both the 2.4L L4 and the 2.7L V6. Each part is matched to the engine(s) it fits.

Do ignition parts differ between 2005 Kia Optima engines?

Yes. Every ignition part on this page is engine-specific. Each row shows which engine(s) it fits — use the filter at the top to hide the rest. If you're unsure which engine you have, check the emissions label under the hood or the 8th character of your VIN.

What are the signs of ignition problems on a 2005 Kia Optima?

Common symptoms include misfires under load, rough idle, flashing check-engine light, or poor starting in damp weather. If you notice any of these, identify the affected subcategory above and cross-reference the part numbers listed.

What spark-plug gap is listed for the 2005 Kia Optima?

Notes on this page include pre-set gaps of 0.032", 0.035", 0.040", 0.041", 0.043", 0.044", 0.045", 0.05", 0.054" and 0.063". Still verify against spec — even “pre-gapped” plugs should be checked before they go in.

What should I replace at the same time?

Where labor overlaps, replace plugs and wires (or coil boots) as a set — one weak cylinder makes the whole set feel bad.

What do the market flags (US, CA, MX) on each part mean?

They show the market for which the manufacturer published application data for that part — where the vehicle was first sold, not where the part was made. If your 2005 Kia Optima was originally sold in the US, the safest choice is a part marked for the US market.

How do I make sure a part fits my 2005 Kia Optima?

First match the engine — each row shows which engine(s) the part fits. Then gap matters even on “pre-gapped” plugs — verify against spec, and replace coil boots when they come off a high-mileage engine. The notes column carries position and trim qualifiers where they apply.

Other Parts for the 2005 Kia Optima

Ignition Parts for Other Kia Optima Years

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Manufacturer names, model designations and part numbers are used for identification and fitment reference only. AutoFactsDB is an independent catalog and is not affiliated with, endorsed by, or sponsored by any vehicle manufacturer displayed on this page.