Lambda and O2 sensors
Oxygen sensor circuits, heaters and response. Includes both the pre-cat sensor that drives fuelling and the post-cat sensor that judges the catalyst.
21 documented codes across 76 real diagnostics.
Ranked by how often we actually see them
| Code | What it is | Diagnostics |
|---|---|---|
| P0135 | O2 sensor heater circuit, bank 1 sensor 1 | 11 |
| P2196 | O2 sensor signal biased or stuck rich, bank 1 sensor 1 | 9 |
| P0130 | O2 sensor circuit, bank 1 sensor 1 | 7 |
| P0141 | O2 sensor heater circuit, bank 1 sensor 2 | 7 |
| P0134 | O2 sensor circuit no activity detected, bank 1 sensor 1 | 5 |
| P0136 | O2 sensor circuit, bank 1 sensor 2 | 4 |
| P0140 | O2 sensor circuit no activity detected, bank 1 sensor 2 | 4 |
| P0031 | O2 sensor heater control circuit low, bank 1 sensor 1 | 4 |
| P0030 | O2 sensor heater control circuit, bank 1 sensor 1 | 3 |
| P0131 | O2 sensor circuit low voltage, bank 1 sensor 1 | 3 |
| P0138 | O2 sensor circuit high voltage, bank 1 sensor 2 | 3 |
| P0132 | O2 sensor circuit high voltage, bank 1 sensor 1 | 2 |
| P0133 | O2 sensor circuit slow response, bank 1 sensor 1 | 2 |
| P0139 | O2 sensor circuit slow response, bank 1 sensor 2 | 2 |
| P2A00 | O2 sensor circuit range/performance, bank 1 sensor 1 | 2 |
| P0157 | O2 sensor circuit low voltage, bank 2 sensor 2 | 2 |
| P0062 | Not individually documented | 2 |
| P0051 | O2 sensor heater control circuit low, bank 2 sensor 1 | 1 |
| P0154 | O2 sensor circuit no activity detected, bank 2 sensor 1 | 1 |
| P0137 | O2 sensor circuit low voltage, bank 1 sensor 2 | 1 |
| P0151 | O2 sensor circuit low voltage, bank 2 sensor 1 | 1 |
FAQ
Frequently asked questions
How do I run a diagnosis?
Select the vehicle on Start, click the Diagnostic card and choose New diagnostic. Fill in the description, the error codes and the mileage, then click Analyze.
Learn more: Diagnostic (vehicle-first start), Diagnostic form: description, error codes and mileage
Do I have to type the codes from my scan tool?
No. Click the camera button next to Error codes and take or choose a photo (JPEG or PNG) of the scan tool's screen; WrenchLane reads the codes and their descriptions into the form. You can also speak them with the microphone.
Learn more: OBD reader photo scan (fault codes from a photo), Voice input for the problem description
Are the public fault code pages built from my diagnostics?
They are built from anonymised, aggregated diagnostics run in WrenchLane; no workshop, customer or vehicle can be identified. Each fault code page shows how often the code was seen across those diagnostics and in how many separate workshops.
Learn more: Fault code pages on wrenchlane.com (fault-code cluster)
Work a lambda and o2 sensors fault on a real car
Enter the codes and the symptoms and get ranked probable causes for that specific vehicle, with the checks in the order worth doing them. Free account, no card.
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