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3 causes listed
– Open circuit
– Short circuit to ground
– Mass air flow sensor
A dealer should have and use the special #9637 tool and a PST2/PWIS to check the first 2. Or they can just plug in a new MAF and drive it for a while.
About the only thing you can still check is that the air cleaner is clean.
You buy a used car...things are going to go wrong..no matter the make/model.
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