This page lists 26 electrical parts for the 2021 Acura Ilx, across 5 part types, covering the 2.4L L4 engine. Every part shows its brand, manufacturer part number and fitment notes.
On the 2021 Acura Ilx, the electrical system covers charging, starting and the sensors and modules the vehicle relies on, from alternator and starter to oxygen sensors. 18 parts of the 26 listed are Alternator / Generator (7 parts), Starter Motor (6 parts) and Battery (5 parts). The other 2 part types cover the remaining 8 parts.
The 2021 Acura Ilx came with a single engine, the 2.4L L4, and every part is verified against it.
18 brands supply electrical parts for the 2021 Acura Ilx, led by FVP (3 parts), WAI GLOBAL (2 parts) and ACDELCO (2 parts), plus 15 more brands. Quality grades include Remanufactured, Standard Replacement and New.
A "Popular" badge means the source catalog flagged the part as frequently chosen for the 2021 Acura Ilx. 5 parts have it, including ACDELCO 3343085 (Alternator / Generator) and DELPHI SS12404 (Speed Sensor). Each part number opens a page with every vehicle that part fits.
Alternator / Generator
New
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| TYC | 221154 | 🇺🇸 US 🇨🇦 CA | 135 Amps | View on Amazon |
| WAI GLOBAL | 21154N | 🇺🇸 US 🇨🇦 CA | Denso 135 Amps | View on Amazon |
Remanufactured
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ACDELCO Popular | 3343085 | 🇺🇸 US 🇨🇦 CA | GoldRemanufactured | View on Amazon |
| DENSO Popular | 2101212 | 🇺🇸 US 🇨🇦 CA | Reman | View on Amazon |
| BOSCH | AL1325X | 🇺🇸 US 🇨🇦 CA | Remanufactured | View on Amazon |
| FVP | 10268 | 🇺🇸 US 🇨🇦 CA | Remanufactured | View on Amazon |
| PURE ENERGY | 10268 | 🇺🇸 US 🇨🇦 CA | Remanufactured | View on Amazon |
This table covers the alternators that charge the battery and run the electrical load. Typical signs include dim lights at idle, a battery lamp, or a growl from the charging pulley. Load-test the battery and inspect the belt and grounds — a bad ground mimics a failed alternator.
7 Alternator / Generator parts for the 2021 Acura Ilx come from 7 brands — TYC, WAI GLOBAL, ACDELCO and 4 other brands. The "Popular" part is ACDELCO 3343085.
The New section lists 2 options from TYC and WAI GLOBAL — brand-new units rather than rebuilt ones. TYC 221154 is listed in this group.
The Remanufactured section lists 5 options from ACDELCO, DENSO, BOSCH and 2 other brands — factory-rebuilt units with new wear components. ACDELCO 3343085 is listed in this group.
This group includes ACDELCO 3343085, TYC 221154 and WAI GLOBAL 21154N and the remaining parts above.
Alternator / Generator Pulley
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ACKOJA | A26230003 | 🇺🇸 US 🇨🇦 CA | Clutch Pulley | View on Amazon |
| CONTINENTAL | 49958 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| LITENS | 920037A | 🇺🇸 US 🇨🇦 CA | Installation Tool Required | View on Amazon |
This table covers the pulleys on the alternator shaft. Typical signs include a growl or chirp that follows engine speed, or a pulley that will not spin freely by hand. Spin each pulley with the belt off. Roughness or play means replace it with the belt.
3 Alternator / Generator Pulley parts are listed for the 2021 Acura Ilx, from ACKOJA, CONTINENTAL and LITENS.
Part numbers include ACKOJA A26230003, CONTINENTAL 49958 and LITENS 920037A.
Battery
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ACDELCO | 51RAGM | 🇺🇸 US 🇨🇦 CA | AGMBCI Group: 51R | View on Amazon |
| BOSCH | S6594B | 🇺🇸 US 🇨🇦 CA | AGM | View on Amazon |
| DEKA | 9A51RT | 🇺🇸 US 🇨🇦 CA | AGMIntimidator | View on Amazon |
| FVP | P51RAGM | 🇺🇸 US 🇨🇦 CA | Platinum AGM | View on Amazon |
| P1MAX | PMAGM51R | 🇺🇸 US 🇨🇦 CA | BCI Group 51R AGM500 CCA | View on Amazon |
This table covers the batteries listed by group size and specification. Typical signs include slow cranking, a battery lamp, or a no-start after the vehicle sat overnight. Confirm group size and terminal layout in the notes. Clean the posts and the ground before condemning the battery.
5 Battery parts are listed for the 2021 Acura Ilx, from ACDELCO, BOSCH, DEKA and 2 other brands.
Part numbers include ACDELCO 51RAGM, BOSCH S6594B and DEKA 9A51RT, among others listed above.
Speed Sensor
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| BECK/ARNLEY | 0900019 | 🇺🇸 US 🇨🇦 CA | Fits Connector Vertical - Mount hole At 3 O'Clock PositionPanasonic | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DELPHI Popular | SS12404 | 🇺🇸 US 🇨🇦 CA | Connector Shape: Rectangle | View on Amazon |
| STANDARD MOTOR PRODUCTS | SC677 | 🇺🇸 US 🇨🇦 CA | Transmission Input and Output | View on Amazon |
| STANDARD MOTOR PRODUCTS | SC856 | 🇺🇸 US 🇨🇦 CA | Located on TransmissionVehicle Speed | View on Amazon |
| WALKER PRODUCTS | 2401512 | 🇺🇸 US 🇨🇦 CA | Transmission SpeedVendor: Panasonic | View on Amazon |
This table covers the speed sensors on the transmission, transfer case or ABS ring. Typical signs include a dead speedometer, harsh transmission shifts, or a code for vehicle speed. Inspect the tone wheel and the connector before replacing the sensor.
5 Speed Sensor parts are listed for the 2021 Acura Ilx, from STANDARD MOTOR PRODUCTS, BECK/ARNLEY, DELPHI and 1 other brand. DELPHI SS12404 carries the "Popular" badge.
In the Economy grade, BECK/ARNLEY supplies 1 part: the catalog's value-priced group. A representative part number is BECK/ARNLEY 0900019.
The Standard Replacement section lists 4 options from STANDARD MOTOR PRODUCTS, DELPHI and WALKER PRODUCTS — built to original-equipment specification. DELPHI SS12404 is listed in this group.
Part numbers include DELPHI SS12404, BECK/ARNLEY 0900019 and STANDARD MOTOR PRODUCTS SC677, among others listed above.
Starter Motor
New
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WAI GLOBAL Popular | 16384N | 🇺🇸 US 🇨🇦 CA | View on Amazon |
Remanufactured
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PURE ENERGY Popular | 19621 | 🇺🇸 US 🇨🇦 CA | Remanufactured | View on Amazon |
| DENSO | 2806029 | 🇺🇸 US 🇨🇦 CA | Reman | View on Amazon |
| FVP | 19621 | 🇺🇸 US 🇨🇦 CA | Remanufactured | View on Amazon |
| REMY | 16298 | 🇺🇸 US 🇨🇦 CA | Remanufactured | View on Amazon |
| TERREPOWER | 52121 | 🇺🇸 US 🇨🇦 CA | Remanufactured | View on Amazon |
This table covers the starter motors that crank the engine. Typical signs include no motion, a squeal, or a motor that only runs on one speed. Confirm power, ground and the control module before replacing the motor.
6 Starter Motor parts for the 2021 Acura Ilx come from 6 brands — WAI GLOBAL, PURE ENERGY, DENSO and 3 other brands. The "Popular" part is WAI GLOBAL 16384N.
The New section: 1 option from WAI GLOBAL. WAI GLOBAL 16384N is listed in this group.
The Remanufactured section: 5 options from PURE ENERGY, DENSO, FVP and 2 other brands. PURE ENERGY 19621 is listed in this group.
Part numbers include WAI GLOBAL 16384N, PURE ENERGY 19621 and DENSO 2806029, among others listed above.
Buying Electrical Parts for a 2021 Acura Ilx
On this vehicle, the electrical system covers charging, starting and the sensors and modules the vehicle relies on, from alternator and starter to oxygen sensors.
- Confirm you have the 2.4L L4 engine — every part on this page is matched to it.
- Read the notes on each row for position, trim and spec qualifiers before you order.
- Where labor overlaps, clean or renew the battery terminals and grounds with any charging-system repair.
- Cross-reference the manufacturer part number against your old part or a service-manual listing.
Start with the largest groups on this page: Alternator / Generator and Starter Motor .
Frequently Asked Questions
How many electrical parts fit the 2021 Acura Ilx?
Our catalog currently lists 26 electrical parts for the 2021 Acura Ilx across 5 subcategories and 18 brands, covering the 2.4L L4 engine. Each part is matched to the engine(s) it fits.
What are the signs of electrical problems on a 2021 Acura Ilx?
Common symptoms include slow cranking on cold mornings, a battery light that flickers, dim lights at idle, or a check-engine code pointing at a sensor circuit. If you notice any of these, identify the affected subcategory above and cross-reference the part numbers listed.
What should I replace at the same time?
Where labor overlaps, clean or renew the battery terminals and grounds with any charging-system repair.
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 2021 Acura Ilx 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 2021 Acura Ilx?
Every part on this page is matched to the 2.4L L4 engine. Then test before replacing — a failed alternator and a bad ground can look identical, and sensors are frequently condemned for wiring faults. The notes column carries position and trim qualifiers where they apply.
Other Parts for the 2021 Acura Ilx
Electrical Parts for Other Acura Ilx 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.