📖 What Does P0135 Mean?
The heater circuit for the upstream oxygen sensor on bank 1 is not working properly.
Symptoms
Slow warm-up of oxygen sensor, poor fuel economy when cold, check engine light, failed emissions test.
Common Causes
Blown fuse for oxygen sensor heater, faulty oxygen sensor with bad heater, wiring problems to heater circuit.
Possible Solutions
Check and replace oxygen sensor heater fuse, replace oxygen sensor if heater is internal, repair heater wiring.
Recommended Parts & Tools
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📦 Parts Needed
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Frequently Asked Questions about P0135
How serious is P0135?
This code has a medium severity level. This should be diagnosed and repaired soon to prevent further issues.
Can I drive with P0135?
You can typically drive short distances, but have it diagnosed as soon as possible.
How much does it cost to fix P0135?
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 P0135
Oxygen Sensor Circuit Malfunction Bank 1 Sensor 1
Oxygen Sensor Circuit Low Voltage Bank 1 Sensor 1
Oxygen Sensor Circuit High Voltage Bank 1 Sensor 1
Oxygen Sensor Circuit Slow Response Bank 1 Sensor 1
Oxygen Sensor Circuit No Activity Detected Bank 1 Sensor 1
Catalyst System Efficiency Below Threshold Bank 1
💡 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