At firt I was warried as didnt' want to spend hundred on a repair. Fault codes, often referred to as Diagnostic Trouble Code or DTC, gets stored in the Engine Control Unit (ECU). First, you need to read the codes. Many old scanners just churn out generic codes and old ones might not even be able to detect all problems. I had the check engine light come on in my 2008 Audi A6. The battery is not getting charged, or the alternator is not generating enough power. You will also find step-by-step instructions on reading Audi check engine light codes yourself using an OBD-II scanner. The key warning light indicates that there is a fault with your Audi’s engine start system. If your Audi check engine light is flashing, it indicates an engine misfire, which means fuel is not getting burnt efficiently in the cylinders. I have a 2009 Audi a4 2.0 tdi s line. Engine starting issues may arise. The ‘check engine’ light is the most common. Depending on your specific model of A4, your battery is in one of two places: tucked under the plastic cowling in the engine bay, or in the trunk of your car under the false floor. If your Audi check engine light doesn't reset within three to four days, it is time to read the codes. Audi A4 B8 electronic stabilisation program warning light (or traction light) - indicates a malfunction within the traction control system and needs to be checked out by an Audi workshop or a local independant workshop. What codes did it read on the scanner for you to figure it was the loose gas cap ? Follow the same procedure to clear the fault codes by going to the Erase Faults (DTC) menu option. No difference to petrol consumption and the garage confirms no adverse effect on performance. The indicator lamp lights up while the glow plugs are preheating. If not, it is possible that the 2 garages who checked your car might not have had appropriate tools. There is an engine control malfunction. Therefore, you agree to use this information at your own risk. After two weeks in the shop, the check engine light is on. Audi A4 B8 flat tyre indicator warning light - indicates that one or more of your tyres is not inflated correctly. Now, after 1 day of getting the car back from the garage ( where they apparently checked for faults etc ) I have a new problem: the Engine Management Light has come on and the car is going very very slowly. It is not recommended to drive an Audi if the engine light is flashing. Hi there, You should use a diagnostic tool which covers the airbag system such as the, Audi A4 B8 ABS Dash Light - indicates a problem within the ABS or Anti Lock Braking System. You don't need to use a scanner to reset the Audi check engine light as long as the problem was resolved. If the light remain on, it suggests there’s a fault with the alternator and the battery may not be receiving sufficient charge. Audi A4 check engine light reset can also be performed by simply disconnecting the battery cables and the waiting for about a minute for system to completely shut down and the memory to be erased. Figure out why the CEL turned on and fix the problem. Did that help? We don't recommend clearing the Audi check engine light without fixing the problem. This light could be either a glow plug warning light (diesels only) or part of the engine management. Essential Cookies are required to make this site work, without them your browsing experience would not be as good as we want you to have. You need to retrieve the Audi trouble code and we would recommend using the, Audi A4 B8 brake or ABS warning light - this will illuminate if there is either a problem within the ABS system (see the ABS light for more info) or if the brake fluid is too low. Mine is 2010 with 160,000 miles. If your Audi CEL light is flashing, it indicates that the problem is more serious. 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