Quote:
Originally Posted by mtthmpsn
I haven't been on here in a while as I've had good luck lately with my '06 3.0i (218k miles). That said, service engine light came on and called for bank 2 pre-cat 02 sensor replacement. Extremely easy replacement (replaced both pre-cat sensors), I reset sensor adaptation with INPA, and SES has stayed off.
Problem is, it seems like I'm getting about 2mpg less than previously on the last 2 tanks of gas (same driving habits/locations). Is this due to the adaptation reset and should I expect it to improve? Or due to the sensor replacement itself - I would think 02 sensor replacement should IMPROVE mileage?
Any insight would be appreciated.
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This is a very normal happening with winter fuel formations and could be the entire reason. I have a friend who logs all of his fuel fills and every year around November his mpg drops about 5 mpg until spring.