Quote:
Originally posted by zeronero
I think mine might be bad since my mileage is starting to drop, but the check engine light isn't on.
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My '91 300E has only one sensor and that's ahead of the catalytic converter. Later models added sensors after the cat so that the effectiveness of the first sensor could be checked. W/o the additional sensor, there isn't anything to use to verify the operation of the primary sensor. Hence, there may not be a check engine indication of a sensor going bad on your car.