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Originally Posted by PorscheDoc
Yup, I will second that. If MAF sensor falls on it's face hard enough, the car will go into limp mode like being described.
A check with a PST2 for pending codes will rule that in or out.
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Diagnostics with PST2 will definitely rule it out...You can also go to your local Autozone and borrow their OBD II scanner and read whatever fault you have (remember that those "generic" OBD II might not read all your faults- but is a good/cheap way to rule out most faults before going to your dealer and start spending your $$$)another "not so definite" way to test a failing MAF(not a completely failed MAF) would be to disconnect the male MAF connector, you will notice that your acceleration will improve slighty when a bad MAF is unhooked.....Good Luck!