[SyKoHPaTh]

Hey there! Signed up because of the valuable information here.

I'm currently receiving the P0172 code (fuel too rich) from my '00 Echo.

The symptoms I have are exactly what I've read at the beginning of this thread - idle speed is lower than normal, car stutters on acceleration.

I cleaned the MAF sensor (it was FILTHY, like, entirely black on one side!) - I noticed immediate improvement, but the same code popped up again 2 days later. I cleaned the sensor again, thinking I may have missed a spot, but the light reappears shortly after. I cleaned with the non-chlorinated carb/brake cleaner, and dried off.

A couple things that may or may not be important: I used to drive this car over long distances (1 continuous hour twice a day, freeway driving) - I used 89 fuel because I actually got much better gas milage than the 87 I typically use. At the start of this year, I moved closer to work, and my drive time has been cut down to 4-10 minutes, city driving. I stuck with the 89 fuel out of habit - could that be the culprit for "fuel too rich"? The check engine light started appearing about 9 months after I moved.

Any help is appreciated, thanks!