Hello there… Your Passatt is a “Fly by wire” throttle body… Meaning there is no traditional throttle cable between the accel pedal and the engines throttle body. SO… A motor and controller actually open the throttle for you. This system can get out of adjustment. When this occurs there can be a sluggishness to the response of the throttle open/close.
Now… there are a few ways to go about this TBA “Throttle Body Alignment” which involves:
(1) the VW Dealership
(2) The use of “VAG-COM” “Volkswagen Audi Group-Communication” This consists of the correct VAG-COM cable and relevant software. Basically this is the same software used by the Dealership to perform a dizzying array of VW functions, Troubleshooting, Code Reading…etc basically everything you could want to do or see regarding the Audi/VW Engine ECU functionality. It is akin to having the capabilities of the Dealership when it comes to communication to the ECU in your vehicle. ONE of those functions is to Re-calibrate your Fly by Wire Throttle body.
(**) Then there is also the PMTBA… “Poor Mans Throttle Body Allignment” Basically this is a procedure where you get in the vehicle and turn on the ignition for between 2-4 minutes without starting the vehicle. This, according to SOME Folk forces a re-cal on your Throttle Body. OTHER Folk disagree and say that the only real way to do this is via VAG-COM… Or the Dealer (Who is using VAG-COM also).
While I cannot argue that the VAG-COM is able to perform this function…because it can, and rather easily. I have my own VAG software for my 03’ VW GTi, so I know for certain it works.
Go online and research “00’ VW Passatt Throttle Body Alignment” and you will see the PMTBA…Poor mans version… Honestly if memory serves me correctly, I think its simply turning the ignition on for 2-4 minutes without starting the vehicle…if you listen carefully you will hear the Throttle Body working itself back n forth or making noises at least. Some swear by it and say that it indeed works, I have no reason to doubt this as I’ve heard it works.
Im sorry I cannot say for certain that it works… I have the correct software and VAG cable to do this procedure in a formal manner via the software…so I’ve never tried it without… It SHOULD Work however.
See whatcha get… Look up the search parameter I gave you…and that should guide you thru the procedure without using the software… I know the procedure is all over the net…so you will find it. Good Luck and let us know how you make out.