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No. 7: Replacing mass air flow sensor
Average repair cost: $382.36
A malfunctioning mass air flow sensor, or MAF, accounts for 3.49% of repairs, according to CarMD's latest study.
Problems with the MAF can result in decreases in fuel economy between 10% and 25%, since it's the MAF that measures the air coming into the engine and is what calculates how much fuel to inject. In addition to this repair dropping one place in rank, costs have also declined from $409 to $382.