PowertrainP2271
CautionSeverity: Caution - get it checked when you can
O2 Sensor Signal Biased/Stuck Rich (Bank 1 Sensor 2)
Key terms: Control module: a small computer that runs one part of the car · Bank 1: the side of the engine containing cylinder 1 · SAE J2012: the standard generic code list · 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 37
| Brand | Code | Description | System |
|---|---|---|---|
| Ashok Leyland CV | P2271 | O2 Sensor Signal Biased/Stuck Rich (Bank 1 Sensor 2) SAE | Powertrain |
| BAIC Motor | P2271 | O2 Sensor Signal Stuck Rich Brand | Powertrain |
| Mercedes-Benz | P2271 | O2 Sensor Signal Biased/Stuck Rich (Bank 1 Sensor 2) SAE | Powertrain |
| BMW | P2271 | Lean-mixture voltage not reached Brand | Powertrain |
| BYD | P2271 | O2 sensor signal stuck rich Brand | Powertrain |
| Chery | P2271 | Downstream oxygen sensor Aging Brand | Powertrain |
| Daewoo | P2271 | O2 Sensor Signal Stuck Rich Bank 1 Sensor 2 Brand | Powertrain |
| DFFS | P2271 | Downstream oxygen sensor signal Brand | Powertrain |
| DFFX | P2271 | Downstream oxygen sensor aging Brand | Powertrain |
| DFXK | P2271 | O2 Sensor Signal Stuck Rich Brand | Powertrain |
| EOBD | P2271 | Oksygenfølersignal skjev/fast rik bank 1 sensor 2 Brand | Powertrain |
| Ford | P2271 | O2 Circuit (Bank 1, Sensor 2) Brand | Powertrain |
| Geely | P2271 | Downstream O2 Sensor Aging Brand | Powertrain |
| GM | P2271 | O2 Sensor Signal Stuck Rich Bank 1 Sensor 2 Brand | Powertrain |
| Great Wall | P2271 | Downstream oxygen sensor aging Brand | Powertrain |
| Hafei | P2271 | O2 Sensor Signal Stuck Rich Bank 1 Sensor 2 Brand | Powertrain |
| Holden | P2271 | HO2S Signal Stuck Rich Sensor 2 Brand | Powertrain |
| Honda | P2271 | O2 Sensor Signal Biased/Stuck Rich (Bank 1 Sensor 2) SAE | Powertrain |
| Hyundai | P2271 | O2 Sensor Signal Biased/Stuck Rich (Bank 1 Sensor 2) SAE | Powertrain |
| Isuzu | P2271 | O2 Sensor Signal Biased/Stuck Rich (Bank 1 Sensor 2) SAE | Powertrain |
| Land Rover | P2271 | Oxygen sensor 1-2 - Signal stuck rich Brand | Powertrain |
| Maserati | P2271 | Oxygen sensor signal biased rich (bank 1 sensor 2) Brand | Powertrain |
| Mitsubishi | P2271 | O2S(rear) signal stuck rich Brand | Powertrain |
| Opel | P2271 | O2 Sensor Signal Stuck Rich Bank 1 Sensor 2 Brand | Powertrain |
| Peugeot | P2271 | O2 Sensor Signal Biased/Stuck Rich (Bank 1 Sensor 2) SAE | Powertrain |
| Porsche | P2271 | O2 Sensor Signal Biased/Stuck Rich (Bank 1 Sensor 2) SAE | Powertrain |
| Proton | P2271 | O2S(rear) signal stuck rich Brand | Powertrain |
| Saab | P2271 | O2 Sensor Signal Stuck Rich Bank 1 Sensor 2 Brand | Powertrain |
| MG (SAIC) | P2271 | O2 Sensor Signal Stuck Rich Bank 1 Sensor 2 Brand | Powertrain |
| Smart | P2271 | O2 Sensor Signal Biased/Stuck Rich (Bank 1 Sensor 2) SAE | Powertrain |
| Sprinter | P2271 | O2 Sensor Signal Biased/Stuck Rich (Bank 1 Sensor 2) SAE | Powertrain |
| Subaru | P2271 | O2 Sensor Signal Biased/Stuck Rich (Bank 1 Sensor 2) SAE | Powertrain |
| Suzuki | P2271 | O2 Sensor Signal Biased / Stuck Rich (Bank1 Sensor2) Brand | Powertrain |
| SWM Motor | P2271 | The downstream oxygen sensor is aging - the signal continues to be too strong Brand | Powertrain |
| Tata | P2271 | O2 Sensor Signal Stuck Rich Bank 1 Sensor 2 Brand | Powertrain |
| Toyota | P2271 | Downstream oxygen sensor signal too rich during Deceleration Fuel Cut-Off Brand | Powertrain |
| Volkswagen | P2271 | Oxygen (Lambda) sensor signal B1 S2: too rich 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.
5Extended variant codes 3
These 7-character codes are manufacturer-specific variants of P2271 and may be reported by some scan tools.
| Brand | Code | Description | System |
|---|---|---|---|
| Mercedes-Benz | P227100 | Das Signal der Lambdasonde 2 (Zylinderreihe 1) ist in Richtung 'Fett' verschoben. Brand | Powertrain |
| Hyundai | P227100 | If the rear lambda sensor signal is stuck rich under engine over-run condition, ECM sets Brand | Powertrain |
| SsangYong | P227100 | O2 sensor signal stuck rich - bank 1 sensor 2 Brand | Powertrain |
6Related codes
Browse Pxxx codes or P227xx codes.