Oxygen Sensors; codes P0138 & P0140

shumway
Posts: 4
Joined: Wed Feb 27, 2013 4:05 pm

Oxygen Sensors; codes P0138 & P0140

Unread post by shumway » Wed Mar 27, 2013 6:08 pm

I have changed these two sensors more than once. I'll clear the codes, then after a few weeks I'll get the codes again. I have put in AC Delco & another brand. There wasn't a difference. I got the same codes. Any ideas? Thanks.

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ProTech
Posts: 651
Joined: Wed Oct 17, 2012 10:08 am

Re: Oxygen Sensors; codes P0138 & P0140

Unread post by ProTech » Thu Mar 28, 2013 7:23 pm

You could have other symptoms that are setting the oxygen sensor codes, when it really isn't a sensor problem at all. A lean condition, or a rich condition can set the codes. A clogged catalytic converter can set the codes as well. There could also possibly be a wiring problem or even a faulty computer. If sensor replacement doesn't fix the issue, you have to start looking elsewhere for the problem.
GM Dealer Technician For 18+ Years
In the automotive industry for 20+

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