PowertrainP0051
CautionSeverity: Caution - get it checked when you can
HO2S Heater Control Circuit Low (Bank 2 Sensor 1)
Key terms: Oxygen sensor: measures oxygen in the exhaust gas · Mass air flow sensor: measures the air going into the engine · 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
This code is in the fuel and air metering range, which includes fuel-pressure and camshaft-timing faults.
2Common causes
- Dirty or faulty mass air flow sensor
- Vacuum or intake air leak
- Weak fuel pump or clogged fuel filter
- Faulty fuel injector
- Faulty oxygen sensor
- Wiring or connector fault
3Can I drive?
Have it diagnosed promptly. Some codes in this range affect fuel pressure or camshaft timing; if the engine loses power, runs badly, or stalls, stop safely and get professional help.
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 35
| Brand | Code | Description | System |
|---|---|---|---|
| Ashok Leyland CV | P0051 | HO2S Heater Control Circuit Low (Bank 2 Sensor 1) SAE | Powertrain |
| BAIC Motor | P0051 | HO2S Heater Control Circuit Low Bank 2 Sensor 1 Brand | Powertrain |
| Mercedes-Benz | P0051 | HO2S Heater Control Circuit Low (Bank 2 Sensor 1) SAE | Powertrain |
| BMW | P0051 | Short circuit to negative Brand | Powertrain |
| BYD | P0051 | Oxygen sensor heater low Brand | Powertrain |
| Chery | P0051 | Oxygen sensor heater low Brand | Powertrain |
| Daewoo | P0051 | HO2S Heater Control Circuit Low Bank 2 Sensor 1 Brand | Powertrain |
| DFFS | P0051 | Sequential solenoid coil 2 output fault Brand | Powertrain |
| DFFX | P0051 | Oxygen sensor heater low Brand | Powertrain |
| DFXK | P0051 | HO2S Heater Control Circuit Low Bank 2 Sensor 1 Brand | Powertrain |
| EOBD | P0051 | HO2S ogrevalno vezje nizko banka 2 senzor 1 Brand | Powertrain |
| Geely | P0051 | Oxygen sensor heater low Brand | Powertrain |
| GM | P0051 | HO2S Heater Control Circuit Low Bank 2 Sensor 1 Brand | Powertrain |
| Great Wall | P0051 | Oxygen sensor heater low Brand | Powertrain |
| Hafei | P0051 | Oxygen sensor heater low Brand | Powertrain |
| Holden | P0051 | HO2S Heater Control Circuit Low Voltage Bank 2 Sensor 1 Brand | Powertrain |
| Honda | P0051 | HO2S Heater Control Circuit Low (Bank 2 Sensor 1) SAE | Powertrain |
| Hyundai | P0051 | HO2S Heater Control Circuit Low (Bank 2 Sensor 1) SAE | Powertrain |
| Isuzu | P0051 | HO2S Heater Control Circuit Low (Bank 2 Sensor 1) SAE | Powertrain |
| Land Rover | P0051 | HO2S Heater Control Circuit Low (Bank 2 Sensor 1) SAE | Powertrain |
| Mahindra | P0051 | HO2S Heater Control Circuit Low (Bank 2 Sensor 1) SAE | Powertrain |
| Maserati | P0051 | O2 Sensor 2/1 Heater Circuit Low Brand | Powertrain |
| Mitsubishi | P0051 | O2S/LAFS(front) heater2 low Brand | Powertrain |
| Nissan | P0051 | HO2S Heater Control Circuit Low (Bank 2 Sensor 1) SAE | Powertrain |
| Opel | P0051 | HO2S Heater Control Circuit Low Bank 2 Sensor 1 Brand | Powertrain |
| Peugeot | P0051 | HO2S Heater Control Circuit Low (Bank 2 Sensor 1) SAE | Powertrain |
| Porsche | P0051 | HO2S Heater Control Circuit Low (Bank 2 Sensor 1) SAE | Powertrain |
| Proton | P0051 | O2S/LAFS(front) heater2 low Brand | Powertrain |
| Saab | P0051 | HO2S Heater Control Circuit Low Bank 2 Sensor 1 Brand | Powertrain |
| MG (SAIC) | P0051 | HO2S Heater Control Circuit Low Bank 2 Sensor 1 Brand | Powertrain |
| Subaru | P0051 | HO2S Heater Control Circuit Low Brand | Powertrain |
| Suzuki | P0051 | HO2S Heater Control Circuit Low (Bank 2 Sensor 1) Brand | Powertrain |
| Tata | P0051 | Oxygen Sensor 1 - Bank 2 - Heater Low Brand | Powertrain |
| Toyota | P0051 | Sequential solenoid coil 2 output fault Brand | Powertrain |
| Volkswagen | P0051 | Oxygen (Lambda) sensor B2 S1: heating circuit: short to ground; 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 1
These 7-character codes are manufacturer-specific variants of P0051 and may be reported by some scan tools.
| Brand | Code | Description | System |
|---|---|---|---|
| Mercedes-Benz | P005100 | Der Ausgang für Heizung der Lambdasonde 1 (Zylinderreihe 2) hat Kurzschluss nach Masse. Brand | Powertrain |
6Related codes
Browse Pxxx codes or P005xx codes.