I have a 2004 Golf TDI (automatic) that recently started having an issue with "low/reduced" power. The car turns over and starts fine but power is low/reduced until ~2600rpm is reached, then it performs ok at all speeds/rpms (e.g driving in stop and go traffic). Performance remains ok as long as I don't turn the car off. There are 2 error code: "Unexpected Voltage" and "EGR excessive recirculation".
With the MAF sensor unplugged, there is no low/reduced power after start-up and overall performance is ok. The "EGR excessive Recirculation" error remains however.
What do you think? Is it a bad MAF? or something else?
It is most likely the maf, usually that is the mechanical test that you do, unplugg the maf and if runs like a champ then it is the maf, but if you would like to nail down the problem, hook it up to vag.com and it will tell you if the maf is bad.
I've unplugged the MAF on a car with a good MAF just to see what would happen. Power got a lot worse. If you say that overall performance is OK with an unplugged MAF it could really be that you're used to poor performance.
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