hi i ran the codes with a scanner and the shopkey program at school said those are also the two didget codes the scanner said code 328 is EGR (evp) voltage below closed limit and code 334 EGR (evp) voltage above closed limit. What are the probable cause is it the egr vacuem solenoid? or could it just be some vacuem lines? please help
thanks,
Jared


P.S.
is the search function messed up? when i searched it would always return no finds even when i search just "KOEO" i could not find any codes or anything though the search function

 

I am not an expert but if I had to guess I would say the EGR Position sensor (EVP) is faulty. However you could try cleaning the electrical connections to it first. If you go to the repair section of autozone.com it should tell you how to test it. Hope this helps.

 

If the egr vac line aint hooked up these codes appear on my truck they dont set the check engine lite