Hey guys, I can't seem to get the SES (Service Engine Soon) light to stay off. I recently put a valve cover breather on the passenger and driver's side valve covers and I wonder if they have something to do with it. I have a predator tuner and when I read the cades none show up, however the light stays lit until I select to clear the troublecodes. Any ideas on what may be causing this? Thank-you in advance for all of your help.

 

Gotta know what the code or codes are before we can help. Probably P0171 and P0174 because of the breather, PCM thinks you have a vacuum leak.

 

The Predator does not read any codes. I have had a 171 and 174 before, but they read from the Predator. Any ideas on what codes the predator may not be able to read.

joe

 

If you put valve cover breathers on without capping off and disableing your PCV system you'll throw codes as you're allowing unmetered air to enter your intake plenum.