I changed my EGR for the usual reasons. The one which came out didn't look particularly blocked or anything. After that it ran very badly with very little power and cut out a lot. I disconnected the MAF and it was drivable although at reduced performance. I disconnected the battery for a while to force the ecu to relearn everything (I was advised to do this). Now I have the engine light on, the car is drivable but a bit unresponsive and I have P0406 EGR Sensor A circuit high and P0493 EGR control circuit which keep coming back if I try to clear them down. Any ideas what I might be missing? Thanks.