P0135
System
Powertrain (Fuel/Air)
Scanner som krävs
Enhanced OBD2 scanner (live data graphs, freeze frame, battery voltage test)

O2 Sensor Heater Circuit Malfunction (Bank 1 Sensor 1)

Understand P0135, common causes, and the right FOXWELL scanner to diagnose it.

Upstream O2 sensor heater circuit fault — sensor stays cold and fuel trim suffers until warmed.

Vanliga symptom

  • Poor cold fuel economy
  • Failed emissions
  • P0171 after cold start

Typiska orsaker

  • Failed O2 heater
  • Blown fuse for sensor heaters
  • Wiring in exhaust manifold area

Vilken scanner behöver du?

Enhanced OBD2 scanner (live data graphs, freeze frame, battery voltage test)

Använd live-data och freeze frame innan du byter delar. ABS-, SRS- och U-koder kräver oftast en fullsystems-scanner.

Diagnostiktips

  • Spara freeze frame när koden först sätts
  • Rensa koden först efter att orsaken är åtgärdad
  • Kontrollera relaterade väntande koder
  • Verifiera batterispänning över 12,4 V innan du misstänker sensorer

Rekommenderade FOXWELL-scannrar

Vanliga frågor

Can I diagnose P0135 with a basic code reader?
P0135 may set in the engine module, but related diagnostics often benefit from an enhanced or full-system scanner with live data and freeze frame.
Is it safe to drive with P0135?
It depends on the code and symptoms. Flashing check engine lights and misfire codes should be addressed immediately. Consult a professional if unsure.