I got a P0135-O2 Sensor Heater Circuit Malfunction B1S1 (got this code after a few days from a parking lot accident, only damage was to the bumper cover had a dent/bump and headlight broke). I called my indy regrading the code and he said the car may need a computer (PCM) update. I told him the whole scenario and said the o2 sensors usually last 100k, which my car has 106k. He said the PCM will probably need a software update. Should I change my indy or go to him to fix it.

I dont see why my PCM could be faulty all of a sudden.?

P0135 is the only code i have. I am good with fixing my car but never done a o2 sensor,

Anyway to see if its the PCM or O2 sensor itself? (can i just switch wire between bank 1 and 2, without changing the sensor location... or something like that)

Thanks any input will be great

 

It's probably a coincidence that the O2 sensor error popped up few days after the accident UNLESS something hit O2 sensor during the accident.

If you are 100.00% sure O2 sensor [or the related wiring connector] was NOT damaged in anyway, I will call it coincidence.

Buy Bosch O2 sensors (replace on both banks) and that should take care of the error.
If one sensor failed, the other one is probably not too far from failing given 100K+ mileage.

Which model is your E60? If it's a 6 cylinder car, there is enough room to replace the O2 sensor without having to do major surgery.

 

Yes, it is a i6 528xi 2008. I checked the connector it was not loose nor any visible damage to the wire that are visible (some of the o2 wiring in behind engine near firewall). But is there any testing for the o2 sensor that can be done? Ive check many forums but no anwsers, i am unsure of which color wires are the heater.

(if this info helps, via obd2 i have check and saw the the sensor only gets to a temp of 550-590 Celsius, while bank 2 sensor 1 is at 780 Celsius)

 

As far as I know, there is no simple test for O2 sensor.

I am afraid you don't have many alternatives. At minimum, you will need to replace that offending O2 sensor. Last time I checked, O2 sensor was around $108 on Amazon.

 

I have a local bmw recycler, who has alot of used bmw part. Should I give it a try? A used o2 sensor, he is asking 80$ and locally it is 180$.... Also, do you recommend both pre cat replacement at once or just to do all 4 sensors (pre+post) at once?

 

I am not a big fan of trying used parts, especially for MAF, O2 sensor, ignition coils, spark plugs, etc.

I'd replace both pre-cat O2 sensors. IMHO, no need to replace post-cat O2 sensors unless there is a [diagnostic] code set for those sensors.

 

Hey, I am deciding to do a diy. I know where everything is located and how to get at it but how hard are they stuck on, and is there any tips anyone has before I start poking around? I have all the sockets except o2 sensor socket, which I am going to pickup while I get the sensors.

 

3/8" Offset Oxygen Sensor Wrench

I used this to break it loose. Then I used open end short wrench. On I6 engine, there is enough room to work from the top of the engine on passenger side.

 

Would you say they are stuck on there pretty good? or a little forces breaks them loose? Also if i am not mistaken for a 2008 528xi B1S1, the Bosch replacement is Bosch 17098? (also Bosch 17098 works in both banks but ill have some wire leftover for B2S1)

 

I was expecting the O2 sensors to be stuck. I was prepared with cheater bar/extension for the ratchet. However, I was pleasantly surprised they broke loose without much force.

Dab of anti-seize compound (on JUST THE THREADS) goes a long way.