Quote:
Originally Posted by andrewwynn
When I replaced my front O₂,7b first drive had amazing mpg then it dropped back down and was no different or worse.
Did you reset your fuel adaptations after the repair? If not that could easily be the reason.
Tye car will figure out over time what long term fuel trim has to be and if it's off mpg will suffer.
Ambient temperature will affect mpg for a few reasons so I think you may have to ride out a tank of bad mpg and see what happens longer term.
Oh: check your coolant temp real-time. Make sure you are getting to closed loop: I lost a lot of $ paying for extra gas when my thermostat died and I was running rich all the time.
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Glad to hear other's experience on this. If fuel adaptation reset is different than the lambda sensor reset, I'll look into that (I only reset the lambda sensor adaptation). And good advice on coolant temp - I replaced my thermostat less than 2 years ago, but I'll keep an eye on it.