Thread: Planning a "mayor" tune-up
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Old 06-15-2018, 11:52 AM
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bcredliner bcredliner is offline
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There can be several causes of reduction in mileage not associated with 02 sensors. Pre cat sensors are part of establishing proper air/fuel mixture so can be the culprit if mileage is less but so can other issues such as a vacuum leak, MAF etc. That said, 02 sensors replacement guideline is around 80,000 miles.
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