Replacing an o2 sensor?
05-18-2015, 12:13 PM
#1
Replacing an o2 sensor? My check engine light went on indicating a lean condition on the passenger side.
I cleared the code, drove for awhile and the CEL lit up again.
The code was different this time, but was related to the same sensor (P1158).
Ok, jack up the car and after rounding off the corners of the sensor trying to remove it with a wrench, I attached a pair of Vicegrips and hit them with a rubber mallet.
I don't even want to think of what I would have had to do if there hadn't been anti seize on the threads.
Sensor replaced, I decided NOT to clear the code and see if it would go away by itself.
For this to happen, the engine has to go through three coldstarts and a reasonable amount of driving where the sensor test can be done.
Well, after a few weeks, the CEL was still lit and I was like WTF?
Researched some more and the car will not initiate self tests with less then 1/2 a tank of fuel.
Filled up and drove to an appointment, on the return trip the CEL cleared.
WHOO HOO!
By the way, I replaced the sensor with an OEM DELPHI, not a BOSCH.
I cleared the code, drove for awhile and the CEL lit up again.
The code was different this time, but was related to the same sensor (P1158).
Ok, jack up the car and after rounding off the corners of the sensor trying to remove it with a wrench, I attached a pair of Vicegrips and hit them with a rubber mallet.
I don't even want to think of what I would have had to do if there hadn't been anti seize on the threads.
Sensor replaced, I decided NOT to clear the code and see if it would go away by itself.
For this to happen, the engine has to go through three coldstarts and a reasonable amount of driving where the sensor test can be done.
Well, after a few weeks, the CEL was still lit and I was like WTF?
Researched some more and the car will not initiate self tests with less then 1/2 a tank of fuel.
Filled up and drove to an appointment, on the return trip the CEL cleared.
WHOO HOO!
By the way, I replaced the sensor with an OEM DELPHI, not a BOSCH.
05-19-2015, 01:40 AM
#5
Not what i would have done...Your PCM maybe getting faulty readouts from the other sensors. first row of sensors is your primary sensors where it sees the condition of the engine tune, second row is all emissions. They could also lean out your tune to get proper emissions after the catz..
05-19-2015, 09:43 AM
#6
Not what i would have done...Your PCM maybe getting faulty readouts from the other sensors. first row of sensors is your primary sensors where it sees the condition of the engine tune, second row is all emissions. They could also lean out your tune to get proper emissions after the catz..
May not be what you would have done, but it is my way of checking the fault code against what it says is funky, and it worked.
05-19-2015, 09:53 AM
#8
With my OBD monitor I could see the high to low transitions, but not in real time.
With the new sensor, I could see the proper high and low signal range, but I didn't hookup the scope to watch the sine wave for what frequency it was.
I assumed it was correct and decided to "wait it out" to see if the code would actually clear according to spec.
Forgot about the minimum gas tank level.
05-19-2015, 10:44 AM
#9
Same thing happened with my jeep. I replaced one and waited for the cel to go away, which it did this morning. The third cold start since filling up the tank. I did buy the other 3 but waited to see if I was right. It's got a ton of miles so replacing the other 3 sensors I'll consider preventative maintenance.