Audi/VW Guys - 1.8T Problem

[Zack01GC]

@vw16vcabby

if your obd port will not read, chances are good that you have an aftermarket radio or not the correct radio for the car. starting in 97/98 vw/audi ran teh k line to +12 at teh radio. if you have an aftermarket or older stock radio–it shorts to ground and obd port will not work.

if this is the case, have the radio wired in correctly and the obd port will read. it is pin 3 in the black plug off the oem wiring. remove it from the connector and **** will work.

Thanks man, that’s some good info to know, it does have an aftermarket headunit (I didn’t install it).

@EricS4

The car does have an aftermarket radio so you might be spot on.

I’m sure that’s the case. It does have an Alpine headunit and the car is wired for subs (all the wires are just tucked under the back seat), so that is definitely it.