The 2021 Nissan Sentra has 22 electrical switch & relay parts with verified fitment on this page — 10 part types and 6 brands, covering the 2.0L L4 engine. Each part includes a manufacturer part number and application notes.
The switch and relay system on the 2021 Nissan Sentra covers the switches, relays and flashers that route power to everything the driver touches. The largest groups are Oil Pressure Sender / Switch (5 parts), Power Window Switch (5 parts) and Brake Light Switch (2 parts). The other 7 part types cover the remaining 10 parts.
Every part on this page is matched to the 2.0L L4 — the only engine offered in the 2021 Nissan Sentra.
The most listed brands for 2021 Nissan Sentra electrical switch & relay parts are WELLS (9 parts), STANDARD MOTOR PRODUCTS (7 parts) and DORMAN (2 parts), plus 3 more brands. Quality grades include Standard Replacement and Economy.
2 parts on this 2021 Nissan Sentra page carry a "Popular" badge — the source catalog's flag for options frequently chosen for this vehicle — including STANDARD MOTOR PRODUCTS PS650 (Oil Pressure Sender / Switch) and DORMAN 920603 (Power Window Switch). Click any part number to see every vehicle that part fits.
A/C Refrigerant Pressure Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| UAC | SW11759C | 🇺🇸 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.
This group shows a single part: UAC SW11759C.
Brake Light Switch
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DORMAN | 920479 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS | SLS645 | 🇺🇸 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.
2 Brake Light Switch parts for the 2021 Nissan Sentra come from 2 brands — DORMAN and STANDARD MOTOR PRODUCTS.
The Economy section lists 1 option from DORMAN — the catalog's value-priced group. DORMAN 920479 is listed in this group.
In the Standard Replacement grade, STANDARD MOTOR PRODUCTS supplies 1 part: built to original-equipment specification. A representative part number is STANDARD MOTOR PRODUCTS SLS645.
Part numbers include DORMAN 920479 and STANDARD MOTOR PRODUCTS SLS645.
Dimmer Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WELLS | 1S17974 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | with Fog Lights | View on Amazon |
| WELLS | 1S17975 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | without Fog Lights | View on Amazon |
This table covers the dimmer switches that select headlamp high and low beam. 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.
WELLS supplies both parts for the 2021 Nissan Sentra.
Part numbers include WELLS 1S17974 and WELLS 1S17975.
Fog / Driving Lamp Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WELLS | 1S17974 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon |
This table covers the Fog / Driving Lamp 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 Nissan Sentra — WELLS 1S17974.
Headlamp Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WELLS | 1S17974 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | with Fog Lights | View on Amazon |
| WELLS | 1S17975 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | without Fog Lights | View on Amazon |
This table covers the column or dash switches that control the exterior 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.
WELLS supplies both parts for the 2021 Nissan Sentra.
Listed part numbers: WELLS 1S17974 and WELLS 1S17975.
Ignition Starter Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS | US1516 | 🇺🇸 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 Nissan Sentra — STANDARD MOTOR PRODUCTS US1516.
Oil Pressure Sender / Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Popular | PS650 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Terminal Gender: MaleGray | View on Amazon |
| GPD | 1815408 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | with Black Connector | View on Amazon |
| GPD | 1816545 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | with 1 Terminal(s) | View on Amazon |
| HOLSTEIN | 2OPS0347 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon | |
| WELLS | 1S12021 | 🇺🇸 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.
5 Oil Pressure Sender / Switch parts for the 2021 Nissan Sentra come from 4 brands — GPD, STANDARD MOTOR PRODUCTS, HOLSTEIN and 1 other brand. The "Popular" part is STANDARD MOTOR PRODUCTS PS650.
This group includes STANDARD MOTOR PRODUCTS PS650, GPD 1815408 and GPD 1816545 and the remaining parts above.
Power Window Switch
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DORMAN Popular | 920603 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Front Left | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS | DWS2158 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Rear | View on Amazon |
| STANDARD MOTOR PRODUCTS | DWS2241 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Front Right | View on Amazon |
| STANDARD MOTOR PRODUCTS | DWS2233 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Front Left | View on Amazon |
| WELLS | 1S15551 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Rear | 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 Nissan Sentra come from 3 brands — STANDARD MOTOR PRODUCTS, DORMAN and WELLS. The "Popular" part is DORMAN 920603.
The Economy section: 1 option from DORMAN. DORMAN 920603 is listed in this group.
Standard Replacement: 4 parts, from STANDARD MOTOR PRODUCTS and WELLS. A representative part number is STANDARD MOTOR PRODUCTS DWS2158.
Part numbers include DORMAN 920603, STANDARD MOTOR PRODUCTS DWS2158 and STANDARD MOTOR PRODUCTS DWS2241, among others listed above.
Starter Motor Control Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS | RY1964 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon |
This table covers the relays that control the Starter Motor Control 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.
One part is listed for the 2021 Nissan Sentra — STANDARD MOTOR PRODUCTS RY1964.
Turn Signal Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WELLS | 1S17974 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | with Fog Lights | View on Amazon |
| WELLS | 1S17975 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | without Fog Lights | View on Amazon |
This table covers the combination / turn-signal 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.
2 Turn Signal Switch parts for the 2021 Nissan Sentra come from WELLS.
Part numbers include WELLS 1S17974 and WELLS 1S17975.
Buying Electrical Switch & Relay Parts for a 2021 Nissan Sentra
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 2.0L 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 Power Window Switch .
Frequently Asked Questions
How many electrical switch & relay parts fit the 2021 Nissan Sentra?
Our catalog currently lists 22 electrical switch & relay parts for the 2021 Nissan Sentra across 10 subcategories and 6 brands, covering the 2.0L L4 engine. Each part is matched to the engine(s) it fits.
What are the signs of electrical switch & relay problems on a 2021 Nissan Sentra?
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 Nissan Sentra 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 Nissan Sentra?
Every part on this page is matched to the 2.0L 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 Nissan Sentra
Electrical Switch & Relay Parts for Other Nissan Sentra 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.