Engine Warning Lights & Fault Codes on Audi & Volkswagen: What They Mean and What to Do
Modern Audis and Volkswagens feature advanced electronics that continually monitor engine performance. Whenever a yellow or red warning light appears whether it’s the Check Engine Light (CEL) or EPC the vehicle is signalling that something needs attention. These lights correspond to Diagnostic Trouble Codes (DTCs) stored in the vehicle’s ECU. So, what do those codes mean, and how urgent is the issue? In this guide, we’ll explain common fault codes for Audi and VW models, break down what each warning light implies, and outline practical steps you can take to address the problem. What Are Engine Warning Lights and Why They Matter Audi and VW vehicles use onboard diagnostics (OBD) to monitor engine, emissions, ignition, and fuel systems. Warning lights...