Q: P0135 O2 sensor heater circuit bank 1 sensor 1

asked by on September 30, 2016

What does this mean? I have already replaced the O2 sensor and it still shows this code.
My car has an automatic transmission.

Hello. P0135 is the code for an oxygen sensor heater circuit malfunction, bank 1 sensor 1. If bank 1 sensor 1 oxygen sensor has been replaced, then it may be possible that the issue is with the wiring or connector that go to the sensor. Heated oxygen sensors use four wires, two for the oxygen sensor signal, and two for the heater circuit. I would test the wires of the oxygen sensor circuit to determine if there is proper voltage. If there is not, i would carefully examine the wiring and connector. A certified professional from YourMechanic can assist with diagnosis of the code by inspecting the car firsthand and pinpointing the underlying issue.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Overheating

The coolant in the engine cooling system requires it to be circulated from the radiator to the water pump, thermostat, engine, and then back to the radiator. If the radiator hoses to and from the radiator are cold, then you...

Why will the car go into drive but won’t move??

Hi Ashley. Thanks for contacting us tonight. Sometimes this problem is caused by a damaged shift solenoid, contaminated transmission fluid or a torque converter that is wearing our or already damaged. It's also possible for internal transmission components to be...

The battery light and the emergency brake light illuminate when I turn on the car. The car shakes when they are on.

Hello and thank you for your question. Check your alternator for voltage at low idle and when the engine is at 3,000 rpm. It sounds like the alternator is not producing enough voltage at a low rpm. The battery light...

Related articles

P2670 OBD-II Trouble Code: Actuator Supply Voltage B Circuit Low
P2670 P2670 code definition A P2670 trouble code indicates the detection of a problem by the PCM or a supporting control module in the actuator supply voltage B circuit. Some of the possible modules that could detect this fault include...
P0254 OBD-II Trouble Code: Injection Pump Fuel Metering Control “A” High (Cam/Rotor/Injector)
The The P0254 Trouble Code indicates issues with the inject pump fuel metering control “A” high (cam/rotor/injector). What the P0254 code means When this code appears, it means that the powertrain control module has found an issue with the signal...
P3429 OBD-11 Trouble Code: Cylinder Exhaust Valve Control Circuit/Open
What What the P3429 code means This code indicates that there is a problem with the exhaust valve on cylinder number 4. Your vehicle’s control module detects that the measured values from the MAP sensor, MAF sensor, and TP sensor...