PowertrainP0151
CautionSeverity: Caution - get it checked when you can
O2 Sensor Circuit Low Voltage (Bank 2 Sensor 1)
Key terms: Catalytic converter: cleans the exhaust gases · Oxygen sensor: measures oxygen in the exhaust gas · Bank 2: the side of the engine containing cylinder 2 · SAE J2012: the standard generic code list · Powertrain: engine, transmission and emissions
1What it means in plain English
The oxygen sensor before the catalytic converter on the second bank of cylinders is reporting a voltage that is too low.
2Common causes
- Faulty oxygen sensor
- Vacuum or intake air leak
- Weak fuel pressure
- Exhaust leak before the sensor
- Damaged wiring or connector
3Can I drive?
Usually safe to drive gently. If the engine hesitates or surges, have it checked soon.
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 43
| Brand | Code | Description | System |
|---|---|---|---|
| Ashok Leyland CV | P0151 | O2 Sensor Circuit Low Voltage (Bank 2 Sensor 1) SAE | Powertrain |
| BAIC Motor | P0151 | O2 Sensor Circuit Low Voltage Bank 2 Sensor 1 Brand | Powertrain |
| Mercedes-Benz | P0151 | O2 Sensor Circuit Low Voltage (Bank 2 Sensor 1) SAE | Powertrain |
| BMW | P0151 | Short circuit to negative Brand | Powertrain |
| BYD | P0151 | Oxygen sensor low Brand | Powertrain |
| Chery | P0151 | Oxygen sensor low Brand | Powertrain |
| Chrysler | P0151 | Oxygen sensor 2/1 circuit low Brand | Powertrain |
| Daewoo | P0151 | Left Hand Oxygen Sensor Signal Voltage Low Brand | Powertrain |
| Daihatsu | P0151 | O2 sensor system B2S1 Brand | Powertrain |
| DFFS | P0151 | Engine speed information invalid Brand | Powertrain |
| DFFX | P0151 | Oxygen sensor low Brand | Powertrain |
| DFXK | P0151 | Downstream oxygen sensor voltage low Brand | Powertrain |
| EOBD | P0151 | Syresensorkrets låg spänning bank 2 sensor 1 Brand | Powertrain |
| Fiat | P0151 | Lost communication with Occupant Restraint Controller Brand | Powertrain |
| Ford | P0151 | O2 Sensor Circuit Low Voltage (Bank 2 Sensor 1) SAE | Powertrain |
| Geely | P0151 | Oxygen sensor low Brand | Powertrain |
| GM | P0151 | HO2S circuit low voltage bank 2 sensor 1 Brand | Powertrain |
| Great Wall | P0151 | Oxygen sensor low Brand | Powertrain |
| Hafei | P0151 | Oxygen sensor low Brand | Powertrain |
| Holden | P0151 | HO2S Circuit Low Voltage Bank 2 Sensor 1 Brand | Powertrain |
| Honda | P0151 | O2 Sensor Circuit Low Voltage (Bank 2 Sensor 1) SAE | Powertrain |
| Hyundai | P0151 | O2 Sensor Circuit Low Voltage (Bank 2 Sensor 1) SAE | Powertrain |
| Isuzu | P0151 | O2 Sensor Circuit Low Voltage (Bank 2 Sensor 1) SAE | Powertrain |
| Land Rover | P0151 | O2 Sensor Circuit Low Voltage (Bank 2 Sensor 1) SAE | Powertrain |
| Mahindra | P0151 | O2 Sensor Circuit Low Voltage (Bank 2 Sensor 1) SAE | Powertrain |
| Maserati | P0151 | Lost Communication with Occupant Restraint Controller Brand | Powertrain |
| Mazda | P0151 | O2 Sensor Circuit Low Voltage (Bank 2 Sensor 1) SAE | Powertrain |
| Mitsubishi | P0151 | O2S/LAFS 2(front) low Brand | Powertrain |
| Nissan | P0151 | Heated oxygen sensor 1 Brand | Powertrain |
| Opel | P0151 | HO2S circuit low voltage bank 2 sensor 1 Brand | Powertrain |
| Perodua | P0151 | O2 sensor system B2S1 Brand | Powertrain |
| Peugeot | P0151 | O2 Sensor Circuit Low Voltage (Bank 2 Sensor 1) SAE | Powertrain |
| Porsche | P0151 | O2 Sensor Circuit Low Voltage (Bank 2 Sensor 1) SAE | Powertrain |
| Proton | P0151 | O2 Sensor Circuit Low Voltage (Bank 2 Sensor 1) SAE | Powertrain |
| Renault | P0151 | O2 Sensor Circuit Low Voltage (Bank 2 Sensor 1) SAE | Powertrain |
| Saab | P0151 | HO2S circuit low voltage bank 2 sensor 1 Brand | Powertrain |
| MG (SAIC) | P0151 | Oxygen Sensor Sensor 01 Bank 2 Circuit Low Brand | Powertrain |
| Sprinter | P0151 | O2 Sensor Circuit Low Voltage (Bank 2 Sensor 1) SAE | Powertrain |
| Subaru | P0151 | O2 Sensor Circuit Low Voltage Brand | Powertrain |
| Suzuki | P0151 | O2 sensor (Bank 2 Sensor 1) circuit low voltage shift Brand | Powertrain |
| Tata | P0151 | O2 Sensor Circuit Low Voltage Bank 2 Sensor 1 Brand | Powertrain |
| Toyota | P0151 | Engine speed information invalid Brand | Powertrain |
| Volkswagen | P0151 | Oxygen (Lambda) sensor B2 S1: signal too low; Defective 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 P0151 and may be reported by some scan tools.
| Brand | Code | Description | System |
|---|---|---|---|
| SsangYong | P015100 | No.3 Oxygen sensor - below the minimum permissible voltage Brand | Powertrain |
| Mercedes-Benz | P015186 | No description available | Powertrain |
| Smart | P015186 | No description available | Powertrain |
6Related codes
Browse Pxxx codes or P015xx codes.