Q: P0135 O2 sensor heater circuit bank 1 sensor 1

asked by on

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
  1. Home
  2. Questions
  3. P0135 O2 sensor heater circuit bank 1 sensor 1

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

Q: When you turn on the ignition a couple of lights come on but it won't start

Confirm that the "new" battery is actually fully charged. Even if the immobilizer were set at one point or it activated, simply arming and disarming it, via the key FOB or remote, will disable the alarm. There is no "lock...

Q: Check engine light on after storage.

Autozone cannot hook a code reader to any vehicle manufactured before 1996 generally because these are not OBD-II equipped vehicles. An experienced technician like one from YourMechanic however is capable of pulling the check engine light fault codes fro the...

Q: Security system on my new to me car has been toggled on.

Hi there. Try taking the key and putting it in the driver door and unlocking and locking the door 3 times. This will make the computer acknowledge the key and finalize the programming. For the dash sound, that could be...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.