The 2021 Kia Niro has 13 electrical switch & relay parts with verified fitment on this page — 4 part types and 7 brands, covering both the 1.6L L4 ELECTRIC/GAS and the ELECTRIC. Each part includes a manufacturer part number and application notes.
On the 2021 Kia Niro, the switch and relay system covers the switches, relays and flashers that route power to everything the driver touches. 12 parts of the 13 listed are Brake Light Switch (5 parts), Power Window Switch (5 parts) and A/C Refrigerant Pressure Switch (2 parts). The other 1 part type covers the remaining 1 part.
The 2021 Kia Niro was sold with both the 1.6L L4 ELECTRIC/GAS and the ELECTRIC. Every part on this page is engine-specific. Each part shows which engine(s) it fits.
The most listed brands for 2021 Kia Niro electrical switch & relay parts are WELLS (7 parts), HYUNDAI (1 part) and UAC (1 part), plus 4 more brands. Quality grades include Standard Replacement and Economy.
1 part on this 2021 Kia Niro page carries a "Popular" badge — the source catalog's flag for options frequently chosen for this vehicle — STANDARD MOTOR PRODUCTS SLS612 (Brake Light Switch). Click any part number to see every vehicle that part fits.
A/C Refrigerant Pressure Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HYUNDAI Fits: 1.6L L4 ELECTRIC/GAS | 97721D2000 | 🇺🇸 US | Included with suction tube, hose & tube assembly. | View on Amazon |
| UAC Fits: 1.6L L4 ELECTRIC/GAS | 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 Niro come from 2 brands — HYUNDAI and UAC.
Part numbers include HYUNDAI 97721D2000 and UAC SW9969C.
Brake Light Switch
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HOLSTEIN Fits: 1.6L L4 ELECTRIC/GAS | 2BLS0034 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Popular Fits: 1.6L L4 ELECTRIC/GAS | SLS612 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon | |
| ROSTRA Fits: 1.6L L4 ELECTRIC/GAS | 620051 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon | |
| WELLS Fits: 1.6L L4 ELECTRIC/GAS | 1S16381 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon |
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VEMO Fits: 1.6L L4 ELECTRIC/GAS | V52730052 | 🇺🇸 US 🇨🇦 CA | EX Premium or LX Model or LXS Model or Plug-In Hybrid EX or Plug-In Hybrid EX Premium or Plug-In Hybrid LXS or Touring or Touring Special Edition | 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.
5 Brake Light Switch parts for the 2021 Kia Niro come from 5 brands — HOLSTEIN, STANDARD MOTOR PRODUCTS, ROSTRA and 2 other brands. The "Popular" part is STANDARD MOTOR PRODUCTS SLS612.
The Economy section lists 1 option from HOLSTEIN — the catalog's value-priced group. HOLSTEIN 2BLS0034 is listed in this group.
In the Standard Replacement grade, STANDARD MOTOR PRODUCTS, ROSTRA and WELLS supply 3 parts: built to original-equipment specification. A representative part number is STANDARD MOTOR PRODUCTS SLS612.
1 further part sits outside the graded sections, with the same engine-level match.
Part numbers include STANDARD MOTOR PRODUCTS SLS612, HOLSTEIN 2BLS0034 and ROSTRA 620051, among others listed above.
Ignition Starter Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WELLS Fits: 1.6L L4 ELECTRIC/GAS | 1S17792 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | 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.
One part is listed for the 2021 Kia Niro — WELLS 1S17792.
Power Window Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WELLS Fits: 1.6L L4 ELECTRIC/GAS | 1S16487 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Front Leftwith Power Folding Mirrors | View on Amazon |
| WELLS Fits: 1.6L L4 ELECTRIC/GAS | 1S16488 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Front Leftwithout Power Folding Mirrors | View on Amazon |
| WELLS Fits: 1.6L L4 ELECTRIC/GAS | 1S16489 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Front Leftwithout Power Folding Mirrors | View on Amazon |
| WELLS Fits: 1.6L L4 ELECTRIC/GAS | 1S16527 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Front RightChrome/Black | View on Amazon |
| WELLS Fits: 1.6L L4 ELECTRIC/GAS | 1S16561 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Rear Left | View on Amazon |
This table covers the switches that command each window motor. 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.
5 Power Window Switch parts for the 2021 Kia Niro come from WELLS.
Listed part numbers: WELLS 1S16487, WELLS 1S16488 and WELLS 1S16489, plus the other parts above.
Buying Electrical Switch & Relay Parts for a 2021 Kia Niro
On this vehicle, the switch and relay system covers the switches, relays and flashers that route power to everything the driver touches.
- Match the engine first. Every electrical switch & relay 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, 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: Brake Light Switch and Power Window Switch .
Frequently Asked Questions
How many electrical switch & relay parts fit the 2021 Kia Niro?
Our catalog currently lists 13 electrical switch & relay parts for the 2021 Kia Niro across 4 subcategories and 7 brands, covering both the 1.6L L4 ELECTRIC/GAS and the ELECTRIC. Each part is matched to the engine(s) it fits.
Do electrical switch & relay parts differ between 2021 Kia Niro engines?
Yes. Every electrical switch & relay 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 electrical switch & relay problems on a 2021 Kia Niro?
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 Niro 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 Niro?
First match the engine — each row shows which engine(s) the part fits. 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 Niro
Electrical Switch & Relay Parts for Other Kia Niro 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.