Quick checklist
Check O2 sensor heater wiring, test heater
OBD2 Codes
P0135 – O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)
O2 sensor heater problem
Details
The upstream O2 sensor heater circuit is not working.
Typical causesFaulty heater element, wiring issue
SymptomsCheck engine light, slow sensor response
SeverityMedium
DIY checksCheck O2 sensor heater wiring, test heater
ToolsOBD2 scanner, multimeter
Utilities
Copy-paste helpers
Browse More
Explore OBD2 Codes
View all 391 obd2 codes codes
FAQ
Common questions
What causes P0135?
Faulty heater element, wiring issue
Community
Discussion & Experiences
Share your experience, solutions, or ask questions about this error code. Help others troubleshoot!
Loading comments...