Engine Management Light (EML) staying on? Not only is this an indication of a vehicle fault but it is also an MOT failure. Even without the EML displaying, modern vehicles record data that we can interrogate before actual problems occur. Ensuring your vehicle is running at it's optimum performance means greater reliability, economy and reduced emissions. Whilst we often use diagnostics for our scheduled repair work, we also offer this service direct to you and can advise on the best course of action and the risk associated with ECU Codes stored on your vehicle.