P0154: O2 sensor circuit no activity detected, bank 2 sensor 1
What the code tells you on its own
- System
- Powertrain
- Functional group
- Lambda and O2 sensors
- Subsystem
- Fuel and air metering
Engine, fuel, air, ignition, emissions and transmission. The overwhelming majority of what workshops bring to the AI.
What we see when P0154 turns up
Measured across the diagnostics run through Wrenchlane, not taken from a reference table. Figures as of 2026-10-06.
- Diagnostics
- 1
- Separate workshops
- 1
- Arrived code only
- 100%
- Most common marque
- Toyota
March 2026
Seen at a single shop so far
No symptom description entered at all
Where we have seen it most
These are counts from our own work, not a claim about how common the fault is across all vehicles. They describe what independent workshops brought to us, which is a narrower and more specific thing.
Run P0154 against the car in front of you
Enter the code 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.
Start freeOther lambda and o2 sensors codes
- P0135 O2 sensor heater circuit, bank 1 sensor 1
- P2196 O2 sensor signal biased or stuck rich, bank 1 sensor 1
- P0130 O2 sensor circuit, bank 1 sensor 1
- P0141 O2 sensor heater circuit, bank 1 sensor 2
- P0134 O2 sensor circuit no activity detected, bank 1 sensor 1
- P0136 O2 sensor circuit, bank 1 sensor 2
- P0140 O2 sensor circuit no activity detected, bank 1 sensor 2
- P0031 O2 sensor heater control circuit low, bank 1 sensor 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)