The check engine light has been coming on intermittently from the time I got the car in August. I've had it to the dealer 3 times, and it looks like it might finally be fixed, but it's hard to tell.

The first time it came on, I brought it to the dealer. They said it read lean, reset it and gave it back to me. I got the light again within a day or 2.

This kept happening for several weeks, coming on, then going off after a day or so. I did discover a pattern. It seemed that if I ran @ 4000 RPM or above for more than a few minutes, the light would go on.

On the second trip to the dealer, they again said it was reading lean (P0171). They tested the mass airflow sensor and it failed, so they replaced it, tested it for c. 10 miles and gave it back to me.

As expected, the light came on again within a day or so, but this time it seemed to happen at lower revs (c. 3500 RPM). I lived with it for a while and then brought it back for a third time.

They kept it for several days, discovered fouled plugs (which they replaced) and scratched their heads alot. This time they were getting lean and rich readings (P0171 and P2095). Finally, they determined that the oxygen sensors needed to be replaced.

Anyway, I've had it back for 2 days and the light hasn't come back on. So I'm hoping that the problem's solved.

Anyone else run into anything like this?

 

I just saw another thread about CEL problems, so I apologize for starting this one. I didn't see my problem discussed there though, or at least not in an obvious way, so maybe it's not such a big deal (I hope).