Tikiman12

Hello,

I'm getting a P0135 code which is for the driver side front o2 sensor. Since the code is for no heat reading I thought maybe my o2 extension wires had gone bad or burnt so I replaced it with a brand new one, code came back again.

Does that mean the o2 sensor has gone bad and I need to replace it?


I have American racing headers, my rear o2 have been removed but I have not deleted those codes yet. I'm not getting any codes for the front passenger sensor and that's what is making me think I need to replace my driver side one.

Tikiman12

bump

Motorhead-47

P0135 is Bank 1 Sensor 1...forward driver's side o2. If you are getting the code it sounds like you have a bad sensor. This is a common part and should be available at just about any auto parts store.

Tikiman12

correct.

I just wanted to know if I was correct my diagnoses and if there is something else to check before I put a new o2 sensor on there.

Also I checked the fuse and it is fine

Bill Dearborn

If the wires are in good shape the code could be caused by either the ECM or the O2 sensor. Since you don't have the ability to check out the O2 sensor or the ECM the fault is more than likely in the sensor so it is probably cheaper to replace the O2 sensor and hope that is the cause of the code.

Bill

Tikiman12

thats what i'm thinking too.

Thank you Bill

Tikiman12

Terminal Function
A HO2S Low Signal
B HO2S High Signal
C Not used
D Ignition Voltage
E HO2S Heater Low Control


According to this diagram, I can check the E and D with an OHMS meter to see if my "heater" is working?
Or would I Touch E and a ground?

Tikiman12

Ok I touched E and D on the u2 sensor, not plugged into the car. And it pegged my ohm meter all the way to the right, this makes me think the heating element is working.

What could be the cause of the p0135? Could the sensor be clogged and I need to remove it to clean it?

Motorhead-47

You're troubleshooting is flawed. A dead short across those two pins does not tell you the o2 sensor is working.

The o2 sensor is probably the most commonly replaced failed part in modern cars. Your car is a 2005?....a 6-7 year old oxygen sensor. I don't know what you value your personal time to be worth but if it were me, I'd swap that bad o2 sensor and move on. If you haven't convinced yourself yet that it has gone bad, flip flop the driver's side o2 with the passenger side o2 and watch where your problem goes...you'll be looking for code P0136.

Tikiman12

true, and I'd agree if my o2 was old. but my sensors are new as of 2 months ago lol.

Swapping sides is a good idea for a test

Bill Dearborn

Swapping is a great idea.

Bill