PowertrainP0161
CautionSeverity: Caution - get it checked when you can
O2 Sensor Heater Circuit (Bank 2 Sensor 2)
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, air and oxygen sensor range, which also includes coolant temperature 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 if the engine runs badly or the code keeps returning. Because this range includes coolant temperature sensors, watch the temperature gauge: if it climbs into the red, or the engine overheats 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 41
| Brand | Code | Description | System |
|---|---|---|---|
| Ashok Leyland CV | P0161 | O2 Sensor Heater Circuit (Bank 2 Sensor 2) SAE | Powertrain |
| BAIC Motor | P0161 | O2 Sensor Heater Circuit Bank 2 Sensor 2 Brand | Powertrain |
| Mercedes-Benz | P0161 | O2 Sensor Heater Circuit (Bank 2 Sensor 2) SAE | Powertrain |
| BMW | P0161 | Sensor heater faulty Brand | Powertrain |
| BYD | P0161 | Oxygen sensor heater Brand | Powertrain |
| Chery | P0161 | Oxygen sensor heater Brand | Powertrain |
| Chrysler | P0161 | Oxygen sensor 2/2 heater circuit low Brand | Powertrain |
| Daewoo | P0161 | O2 Sensor Heater Circuit Bank 2 Sensor 2 Brand | Powertrain |
| Daihatsu | P0161 | O2 sensor heater system B2S2 Brand | Powertrain |
| DFFS | P0161 | O2 Sensor Heater Circuit Bank 2 Sensor 2 Brand | Powertrain |
| DFFX | P0161 | Oxygen sensor heater Brand | Powertrain |
| DFXK | P0161 | O2 Sensor Heater Circuit Bank 2 Sensor 2 Brand | Powertrain |
| EOBD | P0161 | Syresensor värmekrets bank 2 sensor 2 Brand | Powertrain |
| Ford | P0161 | O2 Sensor Heater Circuit (Bank 2 Sensor 2) SAE | Powertrain |
| Geely | P0161 | Oxygen sensor heater Brand | Powertrain |
| GM | P0161 | HO2S heater performance bank 2 sensor 2 Brand | Powertrain |
| Great Wall | P0161 | Oxygen sensor heater Brand | Powertrain |
| Hafei | P0161 | Oxygen sensor heater Brand | Powertrain |
| Holden | P0161 | HO2S Heater Performance Bank 2 Sensor 2 Brand | Powertrain |
| Honda | P0161 | O2 Sensor Heater Circuit (Bank 2 Sensor 2) SAE | Powertrain |
| Hyundai | P0161 | O2 Sensor Heater Circuit (Bank 2 Sensor 2) SAE | Powertrain |
| Isuzu | P0161 | O2 Sensor Heater Circuit (Bank 2 Sensor 2) SAE | Powertrain |
| Land Rover | P0161 | O2 Sensor Heater Circuit (Bank 2 Sensor 2) SAE | Powertrain |
| Maserati | P0161 | O2 Sensor 2/2 Heater Performance Brand | Powertrain |
| Mazda | P0161 | O2 Sensor Heater Circuit (Bank 2 Sensor 2) SAE | Powertrain |
| Mitsubishi | P0161 | Oxygen sensor2 Brand | Powertrain |
| Nissan | P0161 | Heated oxygen sensor heater Brand | Powertrain |
| Opel | P0161 | HO2S heater performance bank 2 sensor 2 Brand | Powertrain |
| Perodua | P0161 | O2 sensor heater system B2S2 Brand | Powertrain |
| Peugeot | P0161 | O2 Sensor Heater Circuit (Bank 2 Sensor 2) SAE | Powertrain |
| Porsche | P0161 | O2 Sensor Heater Circuit (Bank 2 Sensor 2) SAE | Powertrain |
| Proton | P0161 | Oxygen sensor2 Brand | Powertrain |
| Saab | P0161 | HO2S heater performance bank 2 sensor 2 Brand | Powertrain |
| MG (SAIC) | P0161 | O2 Sensor Heater Circuit Bank 2 Sensor 2 Brand | Powertrain |
| Smart | P0161 | O2 Sensor Heater Circuit (Bank 2 Sensor 2) SAE | Powertrain |
| Sprinter | P0161 | O2 Sensor Heater Circuit (Bank 2 Sensor 2) SAE | Powertrain |
| Subaru | P0161 | O2 Sensor Heater Circuit (Bank 2 Sensor 2) SAE | Powertrain |
| Suzuki | P0161 | O2 Sensor Heater Circuit Malfunction (Bank2 Sensor2) Brand | Powertrain |
| Tata | P0161 | O2 Sensor Heater Circuit Bank 2 Sensor 2 Brand | Powertrain |
| Toyota | P0161 | Heated oxygen sensor 2 heater (bank 2) fault Brand | Powertrain |
| Volkswagen | P0161 | heating circuit: malfunction; 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 3
These 7-character codes are manufacturer-specific variants of P0161 and may be reported by some scan tools.
6Related codes
Browse Pxxx codes or P016xx codes.