How do I fix codes po171 &po300 on my cobalt

Asked by May 31, 2015 at 09:04 PM about the 2007 Chevrolet Cobalt SS Supercharged Coupe FWD

Question type: Maintenance & Repair

I have cleaned the throttle
changed plugs &coils used lucus
injector cleaner nothing worked.
also unplunged the maf and the
rpms jumped to 4k then started
rising unplugged map no change
really need some help it would
greatly be appreciated thank you

2 Answers


You need to check the vehicle fuel pressure to see if the pressure is within factory specs, should be around 52- 65 psi I think , check specs with current dealer specs, this can cause po 171 and po-174 lean condition always, also check for leaking intake seals


It will cause skipping/ misfiring/ lean miss especially when engine is cold

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