I was reading these tend to not fail but slowly deteriorate causing low gas mileage. I could definitely be wrong about that though. At 170k miles I would think they might warrant replacing since I’ve covered just about all other preventative maintenance I can think of except a fuel pump.
I appreciate everyone’s input
I mean, anything is possible of course. But if you are averaging about 17-19 mpg with combined heaving city and occasionally highway driving. Your car is doing good.
I guess you can follow everyone else’s advice on the best prices. But as long as you are not in the low teens of MPG and you are driving like a normal person. I think you are fine.
I get around 18 mpg, and I drive in a lot of traffic. I have 330ci that just passed 150000 miles 2 days ago. I reset my MPG meter, and even with me beating on the car, I’m averaging 15-16 mpg, and that’s that I’m running rich on decel to shoot some flames
. And that’s 16 mpg with strictly driving like a mad man, no calm city or highway driving lol. Now I’m back up to 18. On the highway, I can average low 20s MPG.
If my o2 sensors are good. Yours should be too. I’d replace that fuel pump and fuel filter first.
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