P0155 is a generic OBD-II trouble code that means: Oxygen (O2) Sensor (Bank 2, Sensor 1) – Heater Circuit Malfunction. Usually yes in the short term. The car normally runs fine, but fix it soon to avoid failing an emissions test or causing further problems.
What does P0155 mean?
P0155 is a generic OBD-II trouble code that means: Oxygen (O2) Sensor (Bank 2, Sensor 1) – Heater Circuit Malfunction. The engine control module (ECM) stores this code when it detects a fault related to: Oxygen (O2) Sensor (Bank 2, Sensor 1).
Can I still drive?
Usually yes in the short term. The car normally runs fine, but fix it soon to avoid failing an emissions test or causing further problems.
Symptoms
- Check engine light is on
- Higher fuel consumption
- Failed emissions test
Common causes
- Faulty sensor or component
- Damaged wiring or a loose/corroded connector
How to fix it
- Read all stored codes and freeze-frame data with an OBD-II scanner
- Inspect the wiring and connectors for damage, corrosion or looseness
- Test the sensor with a multimeter against the manufacturer's specification
- Replace the faulty component with a quality part
- Clear the code and road-test the car to confirm the repair
Frequently asked questions
What does code P0155 mean?
P0155 is a generic OBD-II trouble code that means: Oxygen (O2) Sensor (Bank 2, Sensor 1) – Heater Circuit Malfunction. The engine control module (ECM) stores this code when it detects a fault related to: Oxygen (O2) Sensor (Bank 2, Sensor 1).
What causes code P0155?
The most common causes are: Faulty sensor or component; Damaged wiring or a loose/corroded connector.
How do I fix code P0155?
Start with these steps: Read all stored codes and freeze-frame data with an OBD-II scanner; Inspect the wiring and connectors for damage, corrosion or looseness; Test the sensor with a multimeter against the manufacturer's specification; Replace the faulty component with a quality part.
Is it safe to drive with code P0155?
Severity: Low. Usually yes in the short term. The car normally runs fine, but fix it soon to avoid failing an emissions test or causing further problems.