What P0054 means
HO2S Heater Resistance (Bank 1, Sensor 2)
Common causes (general)
Before spending money on parts, verify the code with a scan tool and read freeze frame data. Freeze frame captures every sensor value at the moment the code set — this is often enough to figure out the root cause without further testing.
Manufacturer-specific descriptions
Different manufacturers use this code for slightly different failure modes. Here's what your specific make means by P0054:
| BMW | HO2S Heater Resistance |
| MITSUBISHI | HO2S Heater Resistance (Bank 1 Sensor 2) |
| NISSAN | HO2S Heater Resistance (Bank 1 Sensor 2) |
Read this code on your own car
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