So i scanned my moms 4th gen and got fault codes p1320 and p1400. Anyone care to tell how i can get rid of these codes? Ive replaced spark plugs and a few coils but was told that all coils have to be replaced brand new and if not then the engine harness has to be replaced? Any thoughts?

 

could also be an injector issue as well. I havent heard of the engine harness needing to be replaced at all to cure a misfire issue

 

Agreed.

Clean MAF and TB per how tos. See if that helps. If u have swapped plugs, its either coil or injectors. Check CPS too.

 

Will do. Ill try and clean the parts specified above. Lets see what happens thanks guys.

 

While you're cleaning all of that you might as well clean the IACV.