2.3K views · 17 reactions | From poor performance, rough idle and generally odd behaviour to a check engine light faulty EGR valve can cause a whole host of problems for diesel engines. Here at Regal Autosport we're fully equipped to accurately diagnose and efficiently replace the faulty unit and get your car back on the road in a timely and cost-effective fashion. #egr #egrvalve #a3tdi | Regal Autosport | Facebook