My Audi starts , idles & can not rev or accelerate more than 1200RPM it dies. Put on an Electronic diag tool, it says Faulty Throttle unit? can someone assist?

Asked by Mar 14, 2015 at 07:30 AM about the 1999 Audi A4 1.8T quattro Sedan AWD

Question type: Maintenance & Repair

4 Answers

first of all you should have got your answer from the person who did the diagnostic, however you dont give full detail about your car. e.g year model and millage. its important to check it from that point too. but it seem to me the body Throttle is a problem. and i m thinking it could be a dirty Throttle if thats the case, it must be cleaned by a qualifies Auto electrician. or the Body Throttle will need to be replaced. one must remember the body Throttle serve the same function of the old Carberator, if you know the function of that, the your question is answered. Good luck


Hard to tell by your description. Did they say bad Throttle Position Sensor or replace your entire Throttle Body? Ebay has several for sale right now. From $35-$150. I think the TPS will be attached to the new throttle body when you buy it.


I have a Audi A4 1.8 non turbo with same problem, I replaced throtle body and TPS, Cam sensor, Heat switch with no luck, it starts idles but as soon as you toch the acc pedal it dies. Have any one got the sulution?

4 of 4 people found this helpful.

Arrie, checked out some Youtube videos. A guy was having the same issue as you. This is the answer someone gave him: The symptoms are consistent with bad 02 sensors, and the low boost is limp mode due to the check engine light. If your gas mileage is horrible, the car smells like un-burned fuel it's most certainly 02 sensors as the limp mode is throwing it into full rich. You will need to get it scanned to read the codes to see if its 02 sensors. Other thought would be the MAF sensor is bad, but once again you need to scan the car in order to determine the codes. The MAF issues tend to have the car struggle as you throttle up, then it will rev high as it can't read air flow. 02 and MAF are easy to replace but they are expensive electronic parts. You can find them much cheaper online. The video poster replied back and stated that the issue was in fact bad 02 sensors. The video poster had a turbo but that shouldn't make a difference. Hope this helps!

1 of 1 people found this helpful.

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