P0155
O2 Sensor Heater Circuit Bank 2 Sensor 1
P0155 is an OBD-II diagnostic trouble code meaning: O2 Sensor Heater Circuit Bank 2 Sensor 1. Common causes: open or short circuit in the sensor heating circuit, malfunction of the oxygen sensor itself. Estimated repair cost: $56–167.
Symptoms
- Increased fuel consumption
- Unstable engine operation at idle
- Reduced engine power
- Check Engine Light Illuminates
Causes
- Open or short circuit in the sensor heating circuit
- Malfunction of the oxygen sensor itself
- Problems in the wiring harness or connectors
- Faulty heating circuit relay or fuse
- Problems with the engine control unit (ECU)
How to Fix
- Check the integrity of the sensor heating circuit (resistance and voltage)
- Inspect the wiring harness and connectors for damage.
- Check the fuse and relay of the heating circuit
- If necessary, replace the oxygen sensor
- Clear error memory and check if code is returned
Related codes
Error P0155 by Vehicle Brand
FAQ
What does the P0155 code mean?
P0155 is an OBD-II diagnostic trouble code that indicates: O2 Sensor Heater Circuit Bank 2 Sensor 1
What causes a P0155 error code?
The most common causes of P0155 include: Open or short circuit in the sensor heating circuit; Malfunction of the oxygen sensor itself; Problems in the wiring harness or connectors; Faulty heating circuit relay or fuse.
How do I fix a P0155 diagnostic trouble code?
To fix P0155: Check the integrity of the sensor heating circuit (resistance and voltage). Inspect the wiring harness and connectors for damage.. Check the fuse and relay of the heating circuit. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with P0155?
Limited driving only, diagnose soon
How much does it cost to fix P0155?
The estimated repair cost for P0155 is $56–167. Actual cost depends on your vehicle, location, and labor rates.
See also: Russian version · NationStat