A little update, as the saga continues….

About 4 days after they replaced the MAF sensor, the check engine light came on again with code P0171. Scan gauge showed “ready” and no codes found prior to that, so I think this is a new occurrence (one of the same codes) and not just a case of them forgetting to reset it. I made an appointment for today and just dropped the truck off. (I called back when the light first came back on, but today was the first mutually available time we could arrange)

Over the last couple of weeks, the Check Engine Light will be on for a few days, off for a few days, back on again. The code P0171 has been there constantly throughout, but the code that accompanied it before (P0174) has not showed up.

Not sure what they’re gonna do – should hear back from them by lunch time.

Any thoughts? Those codes indicate lean mixture from left bank and right bank and I was getting both before, now only one bank is showing it. Not sure if I had/have multiple problems causing lean mixture registering? MAF sensor wasn’t bad in the first place?
Computer not really reset? (although Scan Gauge status would indicate it was IF I understand it correctly).

I’m just hoping they don’t say something to the effect of they covered the MAF sensor, but it needs something else expensive and we’re done covering you! Hopefully they will consider this a continuation of the same problem and not try to say it’s something completely different.

I seem to be getting higher gas mileage in the mean time. Got 23.6 MPG per scan gauge on a recent highway trip of about 150 miles doing 70-80 MPH most of the way. Highest I’ve ever seen is maybe 22 MPG – but I should mention that I don’t check that often or with any consistency, so it’s not really conclusive.