Vic

Okay ... I shouldn't have ... but I popped into a Valvoline place for a quick oil change (synthetic) on my 99 A6 and let them change the air filter and cabin filter.

The next morning, it didn't want to start, on the third time it fired up, ran roughly for a minute and threw a check engine light.

The six codes were:

P1237 Cylinder #1 Fuel Injector Circuit - Open Circuit A
P1238 Cylinder #2 Fuel Injector Circuit - Open Circuit A
P1239 Cylinder #3 Fuel Injector Circuit - Open Circuit A
P1240 Cylinder #4 Fuel Injector Circuit - Open Circuit A
P1241 Cylinder #5 Fuel Injector Circuit - Open Circuit A
P1242 Cylinder #6 Fuel Injector Circuit - Open Circuit A

I cleared them and they have not returned and the car is running well again ... was this a coincidence or could they have done something?

TIA
Vic