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Dear German A2 friends, This is my first posting here, as Bret recommended I ask your advice. I have a long ongoing problem with my A2 1.4 petrol. I would be most grateful if you could give me some advice. Below is my last post on the A2OC website on the subject: My Audi A2 has now been with my local Audi dealer for 7 months and they cannot find the problem. They are honestly trying their best. Each time I visit them I am now hoping to hear that the car has fallen off the ramp and is destroyed or it has caught on fire... Just to recap very briefly the problem. Car starts fine....if left ticking over, after about 3 minutes....a slight misfire starts on No.2 cylinder (it is always No.2) 30 seconds later, the EML comes on and there is no more injection signal and the car runs on three cylinders. Clearing the fault code whilst the engine is running restores it to four cylinders again until the misfire starts again and the ECU cuts the signal to the injector. If you start the car and drive immediately away, it will mostly run fine, until you come to a set of lights and again after a few moments at tick-over, it will revert to three cylinders. Turning off the engine, waiting half an hour will make it run on four again. I have and the dealer have done the following: - Replaced both lambda sensors, all the engine sensors bar the knock sensor. - Cleaned the Air flow meter and the EGR valve - Had tested and then checked with another ECU, the ECU - Ran a parallel set of wires from the ECU to No.2 injector - Replaced the injector - Replaced all plugs, wires and the ignition module - Removed the head, checked all valves and cam gear (head has done 5000kms) This car is now on it's third head and tracing the history shows that it has been having problems since 2008 at 70,000kms. We are trying another ignition module as we think that a poor spark on number two cylinder is making the ecu cut the signal. We are all at our wits end. I bought the car for my wife who...let's just say, is less than impressed.... Can anyone tell me if the knock sensor can pick up a misfire on a single cylinder and instruct the ECU to cut the signal to that cylinder? I can imagine the injector signal being cut to avoid bore wash if something else was playing up. As a reminder, the car is a bog standard, nice and simple 1.4 petrol with the AUA engine. My only other thought is a resistance building up in the harness from the ECU to the ignition module on number 2 cylinder causing a poor or delayed spark, thus effecting the combustion, thus causing the ECU to cut the injector signal. Truly gutted by this car. Any pointers more than gratefully appreciated. Philippe The first post can be found here: 1.4 petrol low compression or dealer fast-one? Thank you everyone for your help and apologies for making you read this in English