PowertrainP1274
CautionSeverity: Caution - get it checked when you can
A/F sensor 1 (bank 1)
Key terms: Control module: a small computer that runs one part of the car · Bank 1: the side of the engine containing cylinder 1 · Powertrain: engine, transmission and emissions
1What it means in plain English
The engine or powertrain control system has stored a fault that does not have specific guidance in this database yet.
2Common causes
- Sensor or actuator fault
- Wiring or connector fault
- Vacuum or intake leak
- Fuel or ignition problem
- Control module fault
3Can I drive?
Have it diagnosed promptly. If the car runs and drives normally, drive gently to a workshop. If it runs badly, stalls, overheats, loses oil pressure, or a warning light is flashing or red, stop safely and get professional help. If the code concerns the brakes, brake vacuum or brake assist, do not drive until it is checked: a hard pedal or longer stopping distance means stop.
This page gives general information. It is not professional advice. For a definite diagnosis and a repair quote, ask a qualified mechanic to inspect the car.
4Brand data 23
| Brand | Code | Description | System |
|---|---|---|---|
| BYD | P1274 | Supply pump protection Brand | Powertrain |
| Chery | P1274 | Supply pump protection Brand | Powertrain |
| Daewoo | P1274 | Air/Fuel Ratio Sensor 1 Brand | Powertrain |
| DFFS | P1274 | No description available | Powertrain |
| DFFX | P1274 | Supply pump protection Brand | Powertrain |
| DFXK | P1274 | Pump-Jet Valve: Cylinder 5 (N244): Regulation Range Not Reached Brand | Powertrain |
| EOBD | P1274 | Leerfactor te laag Brand | Powertrain |
| Geely | P1274 | Supply pump protection Brand | Powertrain |
| GM | P1274 | Air/Fuel Ratio Sensor 1 Brand | Powertrain |
| Great Wall | P1274 | Supply pump protection Brand | Powertrain |
| Hafei | P1274 | Supply pump protection Brand | Powertrain |
| Hyundai | P1274 | No description available | Powertrain |
| Isuzu | P1274 | No description available | Powertrain |
| Land Rover | P1274 | Cylinder 4 high to low side is open Brand | Powertrain |
| Mahindra | P1274 | A/F SEN1 Brand | Powertrain |
| Mitsubishi | P1274 | Supply pump protection Brand | Powertrain |
| Nissan | P1274 | Air/Fuel sensor 1 Brand | Powertrain |
| Peugeot | P1274 | No description available | Powertrain |
| Proton | P1274 | Supply pump protection Brand | Powertrain |
| Renault | P1274 | No description available | Powertrain |
| Saab | P1274 | Air/Fuel Ratio Sensor 1 Brand | Powertrain |
| Suzuki | P1274 | A/F SENSOR1 (B1) Brand | Powertrain |
| Toyota | P1274 | A/F sensor 1 (bank 1) Brand | Powertrain |
Legend: SAE is the generic J2012 description; Brand is text taken from that manufacturer’s data. Manufacturer rows keep the wording and language of the source data, and non-English text is tagged so screen readers pronounce it correctly.
5Related codes
Browse Pxxx codes or P127xx codes.