can the check engine light effect thegas mileage
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2002 Mazda Millenia Question: have an 02, check engine light is on, gas mileage is kind of bad.
Answer #1patrick mannion from Greg Solow's Engine Room, November 16, 2011, 22:07Master
If an oxygen sensor is reading incorrectly it can dramatically affect gas mileage. Oxygen sensor test the engine's computer is left unburned in the exhaust and trims fuel mixture accordingly.
Answer #2chinasinoy November 17, 2011, 01:46Journeyman
hi dear friend, I think you must read out the code first. I hope this information can help you.
Answer #302supercharged November 23, 2013, 16:05Rookie
I don't know about the bad gas mileage but make sure your gas cap is in good condition and never take it off unless you intend to fill the tank.