📖 What Does P0155 Mean?
The heater circuit for the upstream oxygen sensor on bank 2 is not working.
Symptoms
Slow fuel control when cold on bank 2, poor cold weather performance, check engine light.
Common Causes
Blown heater fuse, faulty sensor heater, wiring problems to heater circuit.
Possible Solutions
Check heater fuse, replace oxygen sensor, repair heater wiring.
Recommended Parts & Tools
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📦 Parts Needed
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Frequently Asked Questions about P0155
How serious is P0155?
This code has a medium severity level. This should be diagnosed and repaired soon to prevent further issues.
Can I drive with P0155?
You can typically drive short distances, but have it diagnosed as soon as possible.
How much does it cost to fix P0155?
Repair costs vary depending on the root cause, but typically range from $100-300 including parts and labor.
Related Diagnostic Codes
Other codes that may appear with P0155
Oxygen Sensor Circuit Malfunction Bank 2 Sensor 1
Oxygen Sensor Circuit Low Voltage Bank 2 Sensor 1
Oxygen Sensor Circuit High Voltage Bank 2 Sensor 1
Oxygen Sensor Circuit Slow Response Bank 2 Sensor 1
Oxygen Sensor Circuit No Activity Bank 2 Sensor 1
Catalyst System Efficiency Below Threshold Bank 2
💡 Why These Codes Are Related:
- • Similar Issues: Same root cause or component failure
- • Related Problems: Often occur together due to system interactions
- • Sequential Codes: Progressive failure stages or multiple sensors
- • Same System: Components within the same automotive system