P0155Severity: Medium
P0155 – Oxygen Sensor Heater Circuit (Bank 2 Sensor 1)
A fault in the upstream O2 sensor heater circuit on bank 2.
What it means
The heater of the oxygen sensor on the second bank isn't working. The sensor reaches operating temperature late, delaying mixture control.
Symptoms
- Check-engine light
- High fuel use when cold
- Emissions readiness issues
Common causes
- Faulty sensor heater
- Blown fuse
- Wiring/connector issue
- Relay failure
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Frequently asked questions
What does trouble code P0155 mean?
P0155 – Oxygen Sensor Heater Circuit (Bank 2 Sensor 1). The heater of the oxygen sensor on the second bank isn't working. The sensor reaches operating temperature late, delaying mixture control.
Can I drive with a P0155 code?
You can usually drive short distances, but it's best to have it checked before it gets worse.