Hello all, I have a buddy who is having a ton of problems with his vehicle. I myself know more about American made cars. Which why I'm seeking help from you guys.

His vehicle popped this code:
-P1568 - Throttle Control Unit Mechanical Fault.

With a pending code:
-P1113 HO2S 1 Bank 1 Heater Resistance Too High.

So we pulled the throttle body off and cleaned it up and I had my father clean up the computer part of it. Plugged it up without bolting it to the car and turn it to the On position. Every time he turned the key it would open a few millimeters and close. So I had him start pumping the gas pedal and I had opened it by hand over 50% and it started working to what it was receiving from his actions. Then about 30 or seconds it stopped working.

If you read this report: 2000 Audi A6 4.2L Quadttro.pdf

It is showing Engine Coolant Temp 419.00 °F for running for about 5 minutes. Before we took the throttle body off the computer was scanned.

Now one of my questions is where can I find the radiator cap or how to check the coolant on this vehicle?

As I have read if the car gets too hot it goes in to "limp" mode. Which could cause the throttle body to act up and pop that code?

Any ideas on where to start or what to replace?

I was thinking on replacing the temp sensor. I know there is two of them one for the coolant and the computer. Should I replace those first to see if this remedies the problem or if you guys can come up with a list. That would be much appreciated.

Thanks.

 

I would first check the coolant temp sensor.

Second , was a throttle adaption performed?

 

By throttle adaption you mean the mod from fly by wire to linkage? If so. No it has the fly by wire.

 

Yes , electronic throttles need to be adapted.

 

Ok so im the buddie lol... my dad had me take the trottle body off we cleaned out the TPS on the throttle body. Now it work it fixed the prob so if your having this same prob USE ELECTRONIC CLEANED ON THE PRONGS!! the only coad i have now is p1333 and i cant seem to find anything that has that coad on it.