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  #1  
Old 07-15-2011, 08:46 PM
EAL EAL is offline
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O2 sensor 2002 C230K

check engine, code said O2 sensor- replaced- now code 'pending' low voltage P0137 1,2

so now what? thanks
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  #2  
Old 07-16-2011, 05:23 AM
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Clean the MAF, run some injector cleaner in the tank and don't use the cheap gas. Clear the codes and see if they come back.
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  #3  
Old 07-16-2011, 09:01 AM
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Great thanks and I even wondered if the 93 was not really 93 with gas prices so high
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Old 07-16-2011, 03:54 PM
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There are 2 O2 sensors. Did you change the correct one?
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  #5  
Old 07-16-2011, 09:31 PM
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Quote:
Originally Posted by EAL View Post
Great thanks and I even wondered if the 93 was not really 93 with gas prices so high
Unless the station owner is shady i wouldn't worry about that. The lower octane gas will cause problems with the M111, so before you spend tons of money replaceing the O2's try the above. And yes there are two O2's bank1 and bank2.
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Old 07-17-2011, 08:54 PM
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)2 update

ok so yes, we did change the correct one
tried the injector cleaner and the maf cleaner
hmm did not work- THEN my son noted when he made a turn over a bump the warning went off then back on- so he said; electical 'short' or something.

today he spent hours tracing the entire electrical system for me-- and as of now we think that was the problem, drove and no O2 code, no codes pending----so yep maybe did not need that sensor in the first place with the first code, but we are not pro's and bottom line for me- I still think I saved much $$$ if I'd taken to dealer---in my experience who would have replaced just about everything including 'another' wiring harness

this forum is great, thank you all and the administrator, this is not the first time i've asked and gotten valuable advice.
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  #7  
Old 07-18-2011, 08:56 AM
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Was there oil in the O2 sensor harness?
Take a look at this service campaign
Attached Files
File Type: pdf SC Cam solenoid M111 M271.pdf (459.1 KB, 754 views)
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Old 07-18-2011, 12:26 PM
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thanks, i will ask my son-- if yes we will follow up---
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  #9  
Old 07-21-2011, 09:30 PM
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Quote:
Originally Posted by EAL View Post
ok so yes, we did change the correct one
tried the injector cleaner and the maf cleaner
hmm did not work- THEN my son noted when he made a turn over a bump the warning went off then back on- so he said; electical 'short' or something.

today he spent hours tracing the entire electrical system for me-- and as of now we think that was the problem, drove and no O2 code, no codes pending----so yep maybe did not need that sensor in the first place with the first code, but we are not pro's and bottom line for me- I still think I saved much $$$ if I'd taken to dealer---in my experience who would have replaced just about everything including 'another' wiring harness

this forum is great, thank you all and the administrator, this is not the first time i've asked and gotten valuable advice.
Nice job finding the problem glad it all worked out for you.
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