Apparently, my s80 disliked its run down the track when I took it down to the drag strip....

The day after I was at the track, the check engine light with the "engine system service required" comes up. I figured it was nothing, and I borrowed my friend's OBDI diagnostic handheld and plugged it into the diagnostic port to reset it (I figured that mabye I just ran too much air into the intake system or something). According to the tester, the reason for the error code was that it had something to do with the Mass Airflow Sensor. However, the next day while I'm driving...the same check engine light and message comes up.

I've nothing to the factory intake system except add a K&N Filter, which I highly doubt is the problem.

Did I hurt something when I went down the track? I've been trying to reset it every time it comes up with my friend's diagnostic tool, but it won't go away.

Ideas? The car is running fine.

Oh, now another problem: my electric fans won't go off! They stay on for a good 5-10 minutes after the car is turned off and the ignition is out. Why is this? It's really concerning me.

 

oops. quoted my own post by accident/

 

I doubt you hurt anything maybe remove the Mass flow sensor and clean it.

The cooling fan will come on after the car is off if it sees the temp at a certain temp.

Is the Mass flow code the only one coming up?

 

No, there are about 3 others, which are the following:

1.) Engine System
2.) ABS
3.) SRS Airbag Service Immediately
4.) STC

And the engine is running fine, when I'm driving the temp gauge is dead smack in the middle.....so I see no reason why the fans should be running asfterwards. It would be fine if the fans ran only once and awhile, but now it's EVERY TIME I turn the car off.

 

Could be a bad coolant temp sensor or maybe a bad fan.

You need to have all codes pulled.