Could be anything, last time our emissions light came on it was a new DPF and exhaust recirc valve costing £1500+
my A4 avant 2.0TDI quattro is in the audi garage today after this:
Car wouldnt start friday PM, appeared flat battery, central locking not working etc.
Jump started OK & drove home
Switched engine off, & restarted Ok after a few minutes
Left for half and hour with engine off, keys out of ingnition, car locked and fan started at high speed after half an hour.
Started car and fan switched off.
checked every half and hour for a few hours and no fan noise
Checked in morning and car started OK.
Check battery level and was low (with meter), but engine started
Came back a few hours later to take out for quick run (15 mins) to charge barttery, engine management light came on when started.
car drove fine until last corner, then labored a bit, battery light came on and car died – no power, no nothing.
Tried to jump start and nothing.
Called tow company, he manage to start temporarily by pumping accelerator, but engine died after a few seconds.
Diagnostics computer plugged in and it indicated glow plugs fault, which engineer said did not correspond to the problem. Seemed like engine wast getting fuel.
tow company engineer could not do anything so towed to audi.
NB battery is only a few months old, and recently spent £1500+ on DPF and exhaust gas recirc valve
Awaiting for the call from Audi…..
I am going to enquire as to trade in value as I have lost all confidence in this car now.