David Fraser Nicolson Posted March 15 Share Posted March 15 (edited) Audi A7 2016 Diesel quattro 275 BHP Dashboard lit up with most warning light on ? Thought battery was goosed but tested and ok ? Did have engine management light on and was on garage machine and said nox sensor That has vanished and everything else on now Edited March 15 by David Fraser Nicolson spelling Quote Link to comment Share on other sites More sharing options...
Magnet Posted March 16 Share Posted March 16 Hello David, How was the battery tested to come to the conclusion that it was OK? Is the battery the original fitted to the car? Kind regards, Gareth. Quote Link to comment Share on other sites More sharing options...
David Fraser Nicolson Posted March 16 Author Share Posted March 16 Tested at work as we have testers we use on various plant around the Port I work at , navigation aids pilot vessels etc , my mate stuck on his new tester to test cold crank when battery was cold, should be 850 CCA ? got about 790 and tester passed battery as good , I had actually trickle charged it a few nights ago at work just in case it was that, must be connected to the engine management light going out it was on before as the nox and oxygen sensors need replacing according to my local garages diagnostic Quote Link to comment Share on other sites More sharing options...
Magnet Posted March 16 Share Posted March 16 Thanks David, CCA is usually a good indicator of overall battery efficiency, but if original to the car, then I wouldn’t conclusively eliminate it as perhaps a suspect. Guess the car doesn’t have any longish runs with you. Alternator output checked? Kind regards, Gareth. Quote Link to comment Share on other sites More sharing options...
David Fraser Nicolson Posted March 16 Author Share Posted March 16 Battery is second unit I have had but is 5 years old , its a good quality YUASA though , I can see the voltage on my diagnostic app and at idle its 12.8 , don't know if that's normal but wondering if the alternator is healthy Strange thing is the clock has the wrong time so car must have been dead at some point ? still started though Quote Link to comment Share on other sites More sharing options...
flatoutflatbroke Posted March 17 Share Posted March 17 I'd have said 12.8 with the engine running was abit low id be looking for low 14s raising slightly when load is applied Quote Link to comment Share on other sites More sharing options...
Magnet Posted March 17 Share Posted March 17 Hello David, Certainly agree with Richard. Well worth rechecking, and increasing the revs. to around 2,000 Incase it increases. Kind regards, Gareth. Quote Link to comment Share on other sites More sharing options...
David Fraser Nicolson Posted March 18 Author Share Posted March 18 Warning light went out driving home , car gave a little hiccup thought I had run over something , only airbag light left on . Warning light back on this morning though ? Date and time wrong I noticed had to reset sat nav to auto ECU ? or still possible alternator ? thought since I was driving at 30 in a straight line unlikely bad connection Can't get on a machine till May as all garages booked solid in Shetland groan Quote Link to comment Share on other sites More sharing options...
Solution David Fraser Nicolson Posted March 26 Author Solution Share Posted March 26 Looks like its sorted , I thought I would check the connections around the ECU so removed the bulkhead trim and found about 6mm of silt / gunge in the area below the ECU , the drain was blocked and whole area looked damp , after clearing silt and unblocking drain I dried the whole area with electrical solvent . 10 minutes later all warning light went out and have not reappeared and that was 3 days ago, so hopefully 1 Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.