99 merc cougar 2.5 M/T

gas mileage has gone from high 20’s to 12-14 I nee help? also is it possible for o2 sensor to be culprit with out sending a code?


1 thought on “99 merc cougar 2.5 M/T”

  1. First thing is to extract any code that might be stored in the computer.

    Repair anything that needed.

    Yes it is possible for an O2 Sensor to cause this if it gets stuck at a certain reading. But you can use a scan tool to check to see the O2Sensor is fluctuating. between 0 and .1 millivolts.

    Testing your O2sensor

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