Hi all, This is probably a common fault but I can't figure it out. I serviced the car last Monday (fuel, air and oil filters). When I started the car it gave an engine system fault and was low on power. I plugged out the electrical connection on the filter and plugged it back in again and the fault was gone but it came back on the Wednesday morning when I started the car to go to work. So Wednesday evening I had another look at the filter and it was a little bit different than the original. So I put the original back in until I got a new one but the fault was still there. So Thursday evening I put a proper Bosch filter in and tried to start it but still got the fault. A mechanic friend told me it's drawing in air from somewhere and the check the hose that comes off it for the seal. That looked ok but I put an O ring over the collar on top of the filter anyway just to get a bit more of a seal. I started the car and the fault was gone. brought it for a test drive and still ok but when I tried to start the car an hour later it stuttered and the fault came back. I left it overnight and when I tried it Friday morning it was fine. I even went on a 4 hour round trip on Saturday and still no problem... until Sunday evening when it stuttered again when I tried to start it and the fault came back. In fact, it also displayed a "power steering failure" error briefly but that went again. The problem persists this morning. Has anyone else encountered the same symptoms and if so how did you resolve it? Thanks, Niall.