P0135 O2 sensor heater circuit, bank 1 sensor 1
- System
- Powertrain - engine and transmission
What P0135 means
"O2 sensor heater circuit, bank 1 sensor 1" is about the heater built into that sensor, not about the oxygen reading it produces. These sensors only report usefully once hot, so they carry their own heating element, and the computer checks that circuit separately. The code names which sensor's heater by the engine computer's bank and sensor numbering.
This is a standard code. It means the same thing on every make of vehicle.
What the program shows for P0135
The Full scan's on-board self-tests list the oxygen sensor heater results by bank and sensor, which is the heater rather than the sensor, with the limits the car judged them against. The Inspection screen separately reports whether the oxygen sensor heaters monitor is complete or still running.
The Dashboard shows Short fuel trim and Long fuel trim, Air flow, Manifold pressure, Intake air temp, Coolant temp, Throttle position, Accelerator pedal, Air/fuel ratio, O2 sensor (rear), O2 sensor current and whether the Fuel system is in closed loop. Record a drive and the Analysis screen gives the total correction At idle, Fuel trim against air flow, and whether the air flow and pressure sensors agree; the Full scan's On-board self-tests list the Oxygen sensor results by bank and sensor. Record before and after a repair and Compare shows the change in short, long and total trim at idle plus which codes are Gone, New or Still there.
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