PowertrainP0042
CautionSeverity: Caution - get it checked when you can
HO2S Heater Control Circuit (Bank 1 Sensor 3)
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 25
| Brand | Code | Description | System |
|---|---|---|---|
| Ashok Leyland CV | P0042 | HO2S Heater Control Circuit (Bank 1 Sensor 3) SAE | Powertrain |
| BAIC Motor | P0042 | HO2S Heater Control Circuit Bank 1 Sensor 3 Brand | Powertrain |
| BMW | P0042 | HO2S Heater Control Circuit B1S3 Brand | Powertrain |
| BYD | P0042 | HO2S Heater Control Circuit Bank 1 Sensor 3 Brand | Powertrain |
| Chery | P0042 | HO2S Heater Control Circuit Bank 1 Sensor 3 Brand | Powertrain |
| Daewoo | P0042 | HO2S Heater Control Circuit Bank 1 Sensor 3 Brand | Powertrain |
| DFFS | P0042 | Sequential solenoid coil 3 output fault Brand | Powertrain |
| DFFX | P0042 | HO2S Heater Control Circuit Bank 1 Sensor 3 Brand | Powertrain |
| DFXK | P0042 | HO2S Heater Control Circuit Bank 1 Sensor 3 Brand | Powertrain |
| EOBD | P0042 | HO2S-Heizkreisregelung Bank 1 Sensor 3 Brand | Powertrain |
| Geely | P0042 | HO2S Heater Control Circuit Bank 1 Sensor 3 Brand | Powertrain |
| GM | P0042 | HO2S Heater Control Circuit Bank 1 Sensor 3 Brand | Powertrain |
| Great Wall | P0042 | HO2S Heater Control Circuit Bank 1 Sensor 3 Brand | Powertrain |
| Hafei | P0042 | HO2S Heater Control Circuit Bank 1 Sensor 3 Brand | Powertrain |
| Holden | P0042 | HO2S Heater Control Circuit (Bank 1 Sensor 3) SAE | Powertrain |
| Honda | P0042 | HO2S Heater Control Circuit (Bank 1 Sensor 3) SAE | Powertrain |
| Hyundai | P0042 | HO2S Heater Control Circuit (Bank 1 Sensor 3) SAE | Powertrain |
| Isuzu | P0042 | HO2S Heater Control Circuit (Bank 1 Sensor 3) SAE | Powertrain |
| Land Rover | P0042 | HO2S Heater Control Circuit (Bank 1 Sensor 3) SAE | Powertrain |
| Peugeot | P0042 | HO2S Heater Control Circuit (Bank 1 Sensor 3) SAE | Powertrain |
| Porsche | P0042 | Tankfüllstand sig Brand | Powertrain |
| Saab | P0042 | HO2S Heater Control Circuit Bank 1 Sensor 3 Brand | Powertrain |
| MG (SAIC) | P0042 | HO2S Heater Control Circuit Bank 1 Sensor 3 Brand | Powertrain |
| Tata | P0042 | HO2S Heater Control Circuit Bank 1 Sensor 3 Brand | Powertrain |
| Toyota | P0042 | Sequential solenoid coil 3 output fault 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.
5Related codes
Browse Pxxx codes or P004xx codes.