PowertrainP0031
CautionSeverity: Caution - get it checked when you can
HO2S Heater Control Circuit Low (Bank 1 Sensor 1)
Key terms: Oxygen sensor: measures oxygen in the exhaust gas · Mass air flow sensor: measures the air going into the engine · 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
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 40
| Brand | Code | Description | System |
|---|---|---|---|
| Ashok Leyland CV | P0031 | HO2S Heater Control Circuit Low (Bank 1 Sensor 1) SAE | Powertrain |
| BAIC Motor | P0031 | Motor controller IGBT fault Brand | Powertrain |
| Mercedes-Benz | P0031 | HO2S Heater Control Circuit Low (Bank 1 Sensor 1) SAE | Powertrain |
| BMW | P0031 | Short circuit to negative Brand | Powertrain |
| BYD | P0031 | Oxygen sensor heater low Brand | Powertrain |
| Chery | P0031 | Oxygen sensor heater low Brand | Powertrain |
| Daewoo | P0031 | HO2S Heater Control Circuit Low Bank 1 Sensor 1 Brand | Powertrain |
| Daihatsu | P0031 | O2(A/F) sensor heater Brand | Powertrain |
| DFFS | P0031 | Upstream oxygen sensor heating control Brand | Powertrain |
| DFFX | P0031 | Oxygen sensor heater low Brand | Powertrain |
| DFXK | P0031 | Front oxygen sensor heater short to low voltage Brand | Powertrain |
| EOBD | P0031 | HO2S ogrevalno vezje nizko banka 1 senzor 1 Brand | Powertrain |
| Geely | P0031 | Oxygen sensor heater low Brand | Powertrain |
| GM | P0031 | HO2S Heater Control Circuit Low Bank 1 Sensor 1 Brand | Powertrain |
| Great Wall | P0031 | Oxygen sensor heater low Brand | Powertrain |
| Hafei | P0031 | Oxygen sensor heater low Brand | Powertrain |
| Holden | P0031 | HO2S Heater Control Circuit Sensor 1 Brand | Powertrain |
| Honda | P0031 | HO2S Heater Control Circuit Low (Bank 1 Sensor 1) SAE | Powertrain |
| Hyundai | P0031 | HO2S Heater Control Circuit Low (Bank 1 Sensor 1) SAE | Powertrain |
| Isuzu | P0031 | HO2S Heater Control Circuit Low (Bank 1 Sensor 1) SAE | Powertrain |
| Land Rover | P0031 | HO2S Heater Control Circuit Low (Bank 1 Sensor 1) SAE | Powertrain |
| Mahindra | P0031 | Heated oxygen sensor heater 1 Brand | Powertrain |
| Maserati | P0031 | Oxygen sensor heater circuit low (bank 1 sensor 1) Brand | Powertrain |
| Mitsubishi | P0031 | O2S/LAFS(front) heater low Brand | Powertrain |
| Nissan | P0031 | HO2S Heater Control Circuit Low (Bank 1 Sensor 1) SAE | Powertrain |
| Opel | P0031 | HO2S Heater Control Circuit Low Bank 1 Sensor 1 Brand | Powertrain |
| Perodua | P0031 | O2(A/F) sensor heater Brand | Powertrain |
| Peugeot | P0031 | HO2S Heater Control Circuit Low (Bank 1 Sensor 1) SAE | Powertrain |
| Porsche | P0031 | HO2S Heater Control Circuit Low (Bank 1 Sensor 1) SAE | Powertrain |
| Proton | P0031 | O2S/LAFS(front) heater low Brand | Powertrain |
| Saab | P0031 | HO2S Heater Control Circuit Low Bank 1 Sensor 1 Brand | Powertrain |
| MG (SAIC) | P0031 | O2 Sensor Heater Contr. Circ. Brand | Powertrain |
| Smart | P0031 | HO2S Heater Control Circuit Low (Bank 1 Sensor 1) SAE | Powertrain |
| Sprinter | P0031 | HO2S Heater Control Circuit Low (Bank 1 Sensor 1) SAE | Powertrain |
| Subaru | P0031 | HO2S Heater Control Circuit Low Brand | Powertrain |
| Suzuki | P0031 | HO2S Heater Control Circuit Low (Bank 1 Sensor 1) Brand | Powertrain |
| SWM Motor | P0031 | Front oxygen sensor heater short to low voltage Brand | Powertrain |
| Tata | P0031 | HO2S1 Heater Control Circuit Low Brand | Powertrain |
| Toyota | P0031 | Upstream oxygen sensor heater short to low voltage Brand | Powertrain |
| Volkswagen | P0031 | Oxygen (Lambda) sensor B1 S1: heating circuit: short to ground; Lower limit exceeded 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 6
These 7-character codes are manufacturer-specific variants of P0031 and may be reported by some scan tools.
| Brand | Code | Description | System |
|---|---|---|---|
| Mercedes-Benz | P003100 | Der Ausgang für Heizung der Lambdasonde 1 (Zylinderreihe 1) hat Kurzschluss nach Masse. Brand | Powertrain |
| Hyundai | P003100 | If λ sensor heater control circuit is open or short to ground for 5 sec. under front λ sensor heater control condition, ECM sets DTC. This fault is caused by open or short to ground in heater control circuit of front λ sensor or defected lambda sensor unit Brand | Powertrain |
| Sprinter | P003100 | No description available | Powertrain |
| SsangYong | P003100 | HO2S heater circuit low (bank 1 / sensor 1) Brand | Powertrain |
| Mercedes-Benz | P003111 | No description available | Powertrain |
| Sprinter | P003111 | No description available | Powertrain |
6Related codes
Browse Pxxx codes or P003xx codes.