Took VW Beetle 2000, in to have 02 sensor changed. still runs crappy. Mechanic changed a bunch of other sensors, and said that when the air distributor sensor is connected, it runs crappy. When it is not connected, it runs really well. Tried other air distributor sensors, but car ran even crappier. Any suggestions?

SOURCE: coolant temeperature sensors/switches

there is a modual under the res with a blade fues in it. the modual and coonection rot due to coolant spills.great place to put them volkswagen

SOURCE: 1999 VW New Beetle Coolant Temp Sensor

at the back of the cylinder head gearbox end it sits in the water pipe

SOURCE: 2000 new beetle 1.8Ltr Shuts off

The EPC (Electronic Pedal Control) is the "fly by wire" system that controls the throttle, it took the place of the cable that went from the gas pedal to the throttle body on VW. If this light is on and there is also a P0102, MAF (Mass Air Flow) related code stored in the vehicle's computer, the EPC may be caused indirectly from a faulty MAF. If the EPC is on and there is no other codes stored, it could be a faulty electronic throttle body or need to be re-programmed. The vehicle's computer must recognoze the throttle body so when replacing it with new or used it will need to be programmed at the dealer. Recently I replaced a MAF (a common problem on VW's) on a VW Golf and when I cleared the code the EPC went off as well.

Check the engine codes, and replace or repair the faulty sensor (most likely the MAF sensor).

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SOURCE: VW 2000 New Beetle door sensor/car alarm goes off when doors open.

I found a thread - http://forums.vwvortex.com/zerothread?id=1542461 that details the repair of the soldering on the key lock door module. Our 2000 new beetle had the same issue. Also sometimes it refused to start. Soldering pins fixed it all.

Also see http://forums.vwvortex.com/zerothread?id=1015107 for releasing window from track, And door handle from inner panel.

I ripped the door apart and re-solderd the pins. I only had one pin with cracked solder but two others looked thin so I did them while I was in there. It's about a four or five hour project if you have all the tools. (8mm triple square also called an 8mm internal was the hardest to find - Also needed Torx T8 T10 T15 and T30 plus Philips Screw Driver. )
Project is difficult but not too bad for the mechanically inclined. A 7 on a scale of 10.
Since re-soldering pins - no more issues! My guess is that a VW dealer would get $200 for a new moduel plus 5 hours of service time for this gig - easily a $500 to $1000 bill. My cost - several new tools - about $25.00.

SOURCE: my vw beetle stalls out. the mechanic first told

If it was the mass air flow sensor, you will have a check engine light. The small rubber hoses connected to/from the mass air flow connector might have come loose or have a crack, which will cause compression to be too low. Check there before replacing the maf sensor.