David Thor Posted August 20, 2023 Share Posted August 20, 2023 Hello I am having trouble with a 1994 Audi 80 Avant with the ABC engine. The engine shut off while driving and has not started again (battery fine and a strong crank), I have read the engine with a VAG computer and it gave 518 (G69) Throttle position sensor (sporadic - short circuit to earth) and 555 G108 Oxygen (lamda) Sensor (sporadic - impulsible signal.) I installed new original Throttle position sensor and cleared the codes. The codes are now gone even after a lot of starts an no codes to read now. There is fuel in the fuel rail, spark from the spark plugs and 10 volts at the injectors. I hear the fuel pump (I change it after the car died just in case) and have also jumped the fuel pump relay. Seem to be some sensor or computer error I think but as I said no codes now from the engine. Does anyone have any suggestions on what might be wrong and if it is possible that it is the camshaft sensor without code? I had the same problem (no start when cranked) maybe 8 years ago but then the engine gave a code for the camshaft sensor and that did the job. Quote Link to comment Share on other sites More sharing options...
Steve Q Posted August 21, 2023 Share Posted August 21, 2023 Yep could be the cam sensor. Did you change the lambda sensor when it threw up a code? Quote Link to comment Share on other sites More sharing options...
David Thor Posted August 21, 2023 Author Share Posted August 21, 2023 Thanks for the reply! Then is it possible to have a broken cam sensor but no code? No, did not change the lamda sensor, could a bad lamda sensor cause this? Quote Link to comment Share on other sites More sharing options...
Magnet Posted August 21, 2023 Share Posted August 21, 2023 Hello David, 1994 would be very early for reliable diagnostics, so personally I wouldn’t attach too much significance to the ‘no codes’ diagnosis. The old adage is that if you have compression, fuel and spark, then you would expect it to start, subject to a good cranking speed, and the sparks arriving at the correct point! Steve could well be right, and I feel you may just have to substitute sensors on a trial basis. Kind regards, Gareth. Quote Link to comment Share on other sites More sharing options...
David Thor Posted August 21, 2023 Author Share Posted August 21, 2023 Thanks for the reply! Will order a new cam sensor and report back. If anyone has other suggestions, please let me know - Thanks! Quote Link to comment Share on other sites More sharing options...
David Thor Posted August 25, 2023 Author Share Posted August 25, 2023 I changed the cam sensor but still doesn't start. Any ideas? Quote Link to comment Share on other sites More sharing options...
Damage1_1 Posted October 15, 2023 Share Posted October 15, 2023 Check the engine ecu. It's by the glove box. These can get wet and fail. Quote Link to comment Share on other sites More sharing options...
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