20 Electrical switch & relay parts are listed for the 2021 Kia Rio, in 9 part types, covering the 1.6L L4 engine. Each one has a brand, a manufacturer part number and notes that say where it fits.
The switch and relay system on the 2021 Kia Rio covers the switches, relays and flashers that route power to everything the driver touches. The largest groups are Oil Pressure Sender / Switch (7 parts), Brake Light Switch (4 parts) and A/C Refrigerant Pressure Switch (2 parts). The other 6 part types cover the remaining 7 parts.
Every part on this page is matched to the 1.6L L4 — the only engine offered in the 2021 Kia Rio.
The most listed brands for 2021 Kia Rio electrical switch & relay parts are HYUNDAI (4 parts), STANDARD MOTOR PRODUCTS (4 parts) and WELLS (3 parts), plus 7 more brands. Quality grades include Standard Replacement and Economy.
2 parts on this 2021 Kia Rio page carry a "Popular" badge — the source catalog's flag for options frequently chosen for this vehicle — including STANDARD MOTOR PRODUCTS PS411 (Oil Pressure Sender / Switch) and WELLS 1S6857 (Oil Pressure Sender / Switch). Click any part number to see every vehicle that part fits.
A/C Pressure Safety Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VEMO | V52730043 | 🇺🇸 US 🇨🇦 CA | FR Cooler - Manual A/CDouble Pipe IHX | View on Amazon |
This table covers the A/C Pressure Safety switches. Typical signs include a function that works intermittently, or a click without the accessory coming on. Inspect the connector behind the switch; heat-damaged terminals will kill the new part too.
One part is listed for the 2021 Kia Rio — VEMO V52730043.
A/C Refrigerant Pressure Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HYUNDAI | 97721D2000 | 🇺🇸 US | Included with suction tube, hose & tube assembly. | View on Amazon |
| UAC | SW9969C | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Pressure Transducer | View on Amazon |
This table covers the pressure switches on the A/C circuit. Typical signs include a function that works intermittently, or a click without the accessory coming on. Inspect the connector behind the switch; heat-damaged terminals will kill the new part too.
2 A/C Refrigerant Pressure Switch parts for the 2021 Kia Rio come from 2 brands — HYUNDAI and UAC.
Listed part numbers: HYUNDAI 97721D2000 and UAC SW9969C.
A/C System Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| UAC | RE8405C | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon |
This table covers the relays that control the A/C System circuit. Typical signs include a click with no action, or a circuit that works only when you swap in a known-good relay. Swap with an identical relay in the fuse box before buying — it is the fastest test there is.
This group shows a single part: UAC RE8405C.
Brake Light Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HYUNDAI | 93810G8100 | 🇺🇸 US | View on Amazon | |
| STANDARD MOTOR PRODUCTS | SLS605 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon | |
| VEMO | V52730054 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| WELLS | 1S16380 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon |
This table covers the pedal-mounted switch that turns on the brake lamps. Typical signs include a function that works intermittently, or a click without the accessory coming on. Inspect the connector behind the switch; heat-damaged terminals will kill the new part too.
4 Brake Light Switch parts for the 2021 Kia Rio come from 4 brands — HYUNDAI, STANDARD MOTOR PRODUCTS, VEMO and 1 other brand.
This group includes HYUNDAI 93810G8100, STANDARD MOTOR PRODUCTS SLS605 and VEMO V52730054 and the remaining parts above.
Fuel Pump / Circuit Opening Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HELLA | 933332641 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | 5-Pin ConnectorColor: Black, Gray | View on Amazon |
This table covers the relays that control the Fuel Pump / Circuit Opening circuit. Typical signs include a click with no action, or a circuit that works only when you swap in a known-good relay. Swap with an identical relay in the fuse box before buying — it is the fastest test there is.
This group shows a single part: HELLA 933332641.
Ignition Starter Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HOLSTEIN | 2ISW0021 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Key Typewithout Immobilizer | View on Amazon |
| WELLS | 1S17805 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Key Type, without Immobilizer | View on Amazon |
This table covers the ignition switches that feed the starter circuit. Typical signs include a function that works intermittently, or a click without the accessory coming on. Inspect the connector behind the switch; heat-damaged terminals will kill the new part too.
2 Ignition Starter Switch parts are listed for the 2021 Kia Rio, from HOLSTEIN and WELLS.
Part numbers include HOLSTEIN 2ISW0021 and WELLS 1S17805.
Neutral Safety Switch / Range Sensor
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HYUNDAI | 427002H000 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon |
This table covers the Neutral Safety Switch / Range 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.
This group shows a single part: HYUNDAI 427002H000.
Oil Pressure Sender / Switch
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS | PS411T | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | T-Series | View on Amazon |
| UNITED MOTOR PRODUCTS | OPS189 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon | |
| WALKER PRODUCTS | 2561260 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Popular | PS411 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Terminal Quantity: 1Terminal Type: Blade | View on Amazon |
| WELLS Popular | 1S6857 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| HYUNDAI | 947502M315 | 🇺🇸 US | included with filter housing | View on Amazon |
| ROSTRA | 501242 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon |
This table covers the senders and switches that report oil pressure to the gauge or lamp. Typical signs include a lamp that stays on, or a gauge that never moves. Confirm power and ground at the connector before replacing the sender or switch.
7 Oil Pressure Sender / Switch parts for the 2021 Kia Rio come from 6 brands — STANDARD MOTOR PRODUCTS, UNITED MOTOR PRODUCTS, WALKER PRODUCTS and 3 other brands. The "Popular" part is STANDARD MOTOR PRODUCTS PS411.
The Economy section lists 3 options from STANDARD MOTOR PRODUCTS, UNITED MOTOR PRODUCTS and WALKER PRODUCTS — the catalog's value-priced group. STANDARD MOTOR PRODUCTS PS411T is listed in this group.
In the Standard Replacement grade, STANDARD MOTOR PRODUCTS, WELLS, HYUNDAI and 1 other brand supply 4 parts: built to original-equipment specification. A representative part number is STANDARD MOTOR PRODUCTS PS411.
Part numbers include STANDARD MOTOR PRODUCTS PS411, STANDARD MOTOR PRODUCTS PS411T and UNITED MOTOR PRODUCTS OPS189, among others listed above.
Parking Brake Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS | PBS152 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon |
This table covers the Parking Brake switches. Typical signs include a function that works intermittently, or a click without the accessory coming on. Inspect the connector behind the switch; heat-damaged terminals will kill the new part too.
This group shows a single part: STANDARD MOTOR PRODUCTS PBS152.
Buying Electrical Switch & Relay Parts for a 2021 Kia Rio
On this vehicle, the switch and relay system covers the switches, relays and flashers that route power to everything the driver touches.
- Confirm you have the 1.6L 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, inspect the connector terminals behind any failed switch — heat damage there will kill the new part too.
- Cross-reference the manufacturer part number against your old part or a service-manual listing.
Start with the largest groups on this page: Oil Pressure Sender / Switch and Brake Light Switch .
Frequently Asked Questions
How many electrical switch & relay parts fit the 2021 Kia Rio?
Our catalog currently lists 20 electrical switch & relay parts for the 2021 Kia Rio across 9 subcategories and 10 brands, covering the 1.6L L4 engine. Each part is matched to the engine(s) it fits.
What are the signs of electrical switch & relay problems on a 2021 Kia Rio?
Common symptoms include accessories that work intermittently, a click without action, or one function dead while its fuse tests fine. 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, inspect the connector terminals behind any failed switch — heat damage there will kill the new part too.
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 Kia Rio 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 Kia Rio?
Every part on this page is matched to the 1.6L L4 engine. Then swap a suspect relay with an identical known-good one from the fuse box before buying — it is the fastest diagnostic there is. The notes column carries position and trim qualifiers where they apply.
Other Parts for the 2021 Kia Rio
Electrical Switch & Relay Parts for Other Kia Rio Years
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