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Author Topic: Throttle body sensor codes, limp mode with a dead pedal?  (Read 572 times)
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« on: May 14, 2021, 09:10:22 AM »


17579 - Angle Sensor 2 for Throttle Actuator (G188) Implausible Signal

 My b6 a4 the other day refused to start after work. It would fire up and then die. After checking it had 3 codes. Cleared them, started it, and it idled like shit but was fine. Repeated the process a couple times and then it was totally normal. They were codes for both throttle angle sensors.

But now, driving the car, it will randomly have EPC and another light (can't remember) turn on, and it ignores all gas pedal input and I have to pull over. This code comes up and once I clear it and start the car, it will drive totally fine, sometimes for 2 or 3 drive cycles before it happens again, sometimes it'll happen 2 minutes later.

I got a used throttle body, cleaned the valve thoroughly and then ran a throttle body adaptation with vcds. I've ran the adaptation multiple times but the issue persists. After running the adaptation yesterday and then driving it about 2 hours last night and then 45 minutes this morning, it started happening again, about 4 times in 15 minutes.

I found some info online and checked continuity and resistances on the wiring between the TB and the ECU and it all came up fine, nothing over .4 ohms.

2002 Audi A4 B6 Avant 1.8t 5 Speed Quattro - Upgraded DV, Full Catless Exhaust, Chinese K04-015, Silicone TIP, Coilover Suspension, 630CC Bosch Injectors, Coolerworx Shifter Assembly
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« Reply #1 on: May 15, 2021, 01:01:22 PM »

Given that it isn’t a problem 100% of the time resistance checks will only show something amiss if the wiring problem is happening at the moment you check it. Get a good look at the terminal ends in the connector for the throttle body. Make sure they havent widened too much. This could cause the sporatic faults. If they look Ok let the car idle and wiggle test the harness starting at the throttle body working your way towards the ECM. While doing this keep refreshing the DTC listing with VCDS. Also I do not have access to Audi wiring diagrams, but if you do it may be worth looking to see if there are any splices in the harness for any of the wires to the throttle body. 9 times out of 10 if it isn’t a component failure its pin fitment or a splice that is no longer doing its thing properly.
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