Hi -

I just replaced the MAF sensor (also referred to by some as the AMM) on my 2000 2.9 S80. I replaced it because of a surging idle and CEL that was throwing codes p1171 and p1181. The car has about 96K on it.

The replacement seemed to do the trick - no more surging, CEL is off and no more codes. But, I've noticed a couple of things since replacing the part:

1. I'm getting an occasional clunking from the transmission upon acceleration that wasn't there before.

2. The throttle feels smoother and more consistent, but it also seems like the car has lost a bit of power.

My question - the part (bought from a local dealer) came with an orange paper in the box that stated new software must be downloaded with the new MAF (software is part number 9499307). I am going to get this done the next time I visit the dealer, but I was curious if not having the most up to date software might be causing these issues. Note - I have already had the ETM software upgrade performed (part number V030785453-9).

Thanks...

This is not a software "upgrade", but a notification that new hardware has been added to your car. According to my local dealer, this must be done or the ECU will not communicate with the new part??? Same it true for new master window switch.

Klaus
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Please answer, we need to know if the advice is good or bad. The 164 has a new home, all I am left with are 2 turbos :)

Thanks for your response Klaus.

I will have the dealer take care of the software once I get there. In the mean time, I'm wondering if disconnecting the battery for a while will reset things and help the ECU to recognize the new part - similar to what happens when new hardware is discovered on your computer.

Short answer... nope.
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Please answer, we need to know if the advice is good or bad. The 164 has a new home, all I am left with are 2 turbos :)

Cr@p! I hate going to the dealer...

thx