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Mercedes fault code 0138

Tiny
STYPEJACK
  • MEMBER
  • 2002 MERCEDES BENZ C180
  • 80,000 MILES
Hi
My Mercedes C180 2002 has the engine light on.
I have got a code of 0138 and it says O2 sensor high voltage.
Does it need to be replace or could I clean it? Mileage is about 80,000 and which sensor should I change (is there only one) my code reader says bank 1
Thanks for any help
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Saturday, June 30th, 2012 AT 3:00 PM

1 Reply

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
I would not be so quick to do anything. You need a shop with a scanner to monitor the sensor to verify the voltages and if they are off, to determine why. It is the upstream sensor but it could be a variety of things causing it.

Cleaning an o2 does nothing. They are not serviceable.

Roy
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Saturday, June 30th, 2012 AT 4:41 PM

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