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  1. 4

    Do I have a Bad O2 Sensor?

    I've had check engine light on for a while. Got it coded @ autoshop & was told it was an 02 sensor -- no big deal. I've been running for a while no problem but have now noticed a drop in gas mileage. I plan on cleaning MAF & replacing the O2 sensor, but how dow I tell which is bad? From...
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