Help! My EPC (Emissions) or CEL (Check Engine Lamp) is on. There's a very simple thing to check first: your brakelights. If they don't work, check the brake pedal switch. It's a common fault. Also have a look for anything obvious like a loose or failed HT lead, or an audible air leak if that's appropriate for your car. Other than that, you really need to get your car scanned by someone with VAG-COM (VCDS), a VAS computer (the one dealers have), or a OBD-II scanner. Of these, the VAS or VCDS/V