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: How many hour does it call for to replace stabilizer bar ? 2001 Toyota Solara 4 cy

Hi there - I'believe that's a 1-hr job (with the right lifts, tools, etc.). Any project always takes 3 times as long in my own home garage. Unfortunately, this is not a service YourMechanic offers at this time. Thanks for...

Q: Lights come up on the dash all the time

These systems do work in tandem with each other but are two separate systems that would both need to be checked for problems. Contact YourMechanic to test and diagnose both lights coming on to see if from a common condition...

Q: Q: Brakes Squealing

If you only replaced the brake pads and not the rotors or drums (if equipped in the rear), then you may look at getting them replaced or resurfaced. If you are getting squealing only when you push on the brakes...

Related articles

How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
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...