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GM Genuine Parts Oxygen (O2) Sensors are designed, engineered, and tested to rigorous standards, and are backed by General Motors. These sensors are special feedback sensors on your vehicle’s exhaust system and measure the proportion of oxygen in exhaust gases. Using this measurement, the engine control module (ECM) can adjust the air/fuel ratio to near the optimal value of 14.7:1. At this ratio, engine performance, emissions, and fuel economy are all optimized. GM Genuine Parts are the true OE parts installed during the production of or validated by General Motors for GM vehicles. Some GM Genuine Parts may have formerly appeared as ACDelco GM Original Equipment (OE). ⚠ WARNING: Cancer and Reproductive Harm –
| Brand |
ACDelco |
|---|---|
| Part Number (MPN) |
12681390 |
| SKU |
12681390 |
| UPC / GTIN |
193468138429 / 00193468138429 |
| Condition |
New |
| Position |
Downstream Left |
| Other Names |
12681390 |
| Connector Gender |
Female |
| Connector Shape |
Oval |
| Features & Benefits – Bullet 1 |
This part requires programming and/or special setup procedures. GM Service Information describes the procedures and special tools needed to ensure proper operation in the vehicle |
| Features & Benefits – Bullet 2 |
Detects oxygen content in the exhaust gases to help optimize emissions |
| Features & Benefits – Bullet 3 |
Some GM Genuine Parts may have formerly appeared as ACDelco GM Original Equipment (OE) |
| Features & Benefits – Bullet 4 |
GM Genuine Parts are designed, engineered and tested to rigorous standards, and are backed by General Motors |
| Features & Benefits – Bullet 5 |
GM Engineers design and validate OE parts specifically for your Chevrolet, Buick, GMC, or Cadillac vehicle |
| Features & Benefits – Bullet 6 |
GM regularly updates production and service part designs to integrate new materials and technologies |
| Grade Type |
Regular |
| Height (in) |
1 |
| Length (in) |
14.8 |
| Mounting Type |
Threaded |
| Overall Length |
361 |
| PADB ID 557 |
0.71 |
| Programming Required |
Yes |
| Sensor Type |
Heated |
| Terminal Gender |
Male |
| Terminal Quantity |
4 |
| Terminal Type |
Blade |
| Thread Size |
M18x1.5 |
| Weight (lb) |
0.19 |
| Width (in) |
1.6 |
| Wire Quantity |
4 |
| Wiring Harness Length |
8.27 |
| Wrench Size |
22 |
| Wrench Size (mm) |
22 |
| Year |
2025 |
| Make |
Buick |
| Model |
Encore GX |
| Body & Trim |
Avenir |
| Engine & Transmission |
1.3L L3 – Gas |
| GM |
12681390 |
Vehicle Fitment
| Year | Make | Model | Body & Trim | Engine & Transmission |
|---|---|---|---|---|
| 2020 | Buick | Encore GX | Essence | 1.3L L3 – Gas |
| 2020 | Buick | Encore GX | Preferred | 1.3L L3 – Gas |
| 2021 | Buick | Encore GX | Essence | 1.3L L3 – Gas |
| 2021 | Buick | Encore GX | Preferred | 1.3L L3 – Gas |
| 2022 | Buick | Encore GX | Essence | 1.3L L3 – Gas |
| 2022 | Buick | Encore GX | Preferred | 1.3L L3 – Gas |
| 2023 | Buick | Encore GX | Essence | 1.3L L3 – Gas |
| 2023 | Buick | Encore GX | Preferred | 1.3L L3 – Gas |
| 2024 | Buick | Encore GX | Avenir | 1.3L L3 – Gas |
| 2025 | Buick | Encore GX | Avenir | 1.3L L3 – Gas |
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