Service Engine Soon Light coming on and off...

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Dec 23, 2010 | 07:20 AM

#16

d4vid

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Joined: Nov 2010

Posts: 11

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From: Downtown L.A

Quote:

Originally Posted by TeStUdO

Most people have removed it. Removing the plastic undertray won't cause you to throw a code for the cat. I bet you have an exhaust leak, have a dying O2 sensor or cat, or have exposed wires on your O2. What is the exact code you were throwing?

Code was P0138 ....

Dec 23, 2010 | 07:56 AM

#17

gsrboi80

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Joined: Aug 2005

Posts: 7,909

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From: On a cliff

Rear O2 heater circuit. I would check the wiring to the rear o2.

Undertray absolutely did not cause this issue

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