Note, Manual Shift, 2001. Car has lost power, randomly, 4 times in 3 years. I pull over, turn off the car, turn back on and drive off. While driving during these events, the rpm goes to 1,000, at which point the motor flutters and the ECP light comes on. Not Chk Eng.
Note: this engine was modified. Cat converter removed. I dont have more details on the the mod other than electronic tuning was done. Car works perfectly, otherwise. 2 mechanics, one an Audi specialist, could not pinpoint the problem. Have not brought car back to the guy who did the mod.
That’s what you need to do. There is NO way for us to know what the modder did to the original car and these kinds of issues are hard enough to diagnose on an un-modified car. I’d also say the modder disabled your check engine light as all 3 of those codes would throw a check engine every time it sees them. The last 2 because there is no cat.
That said, the EPC light comes on when there is a:
Throttle body failure
Bad ABS Sensor
Failed brake pedal switch – Common problem on Golf 4 & Fabia
Bad ABS Ring
Bad ABS sensor wiring
A failed brake pressure sensor (Inside the ABS Module)
A Bad Engine Sensor
Internal engine problem
Power steering failure
Steering wheel sensor
Wiring issues
And can toss you into Limp Home mode.
The Audi mechanic knows this and likely has looked for these things.
Especially likely on a 19 year old car with modifications. Sensors fail, the car is trying to protect itself from damage. It might also be an error cause by the mods that didn’t appear until now once the car was a bit more worn. Audi plans for that. Your modder doesn’t.
Also, agree with this advice, too, as it is illegal (federal law) whether you have inspections or not in your state.
With an old vehicle like this I would look for an intermittent problem with the throttle position sensor or the accelerator position sensor, these failures can be difficult to capture with the scan tool.
I think that the modifications have nothing to do with the malfunction.
I sent my problem and engine codes to APR, the software company … we installed their product. Googling the APR product you can see other ppl have had the same problem. Let you know…
Altho more research didn’t reveal much, the car started idling poorly and got worse. Took it in and one O2 sensor is dead and two manifold intake hoses are very loose.