Last week, I had to take my Omega to the local Vauxhall dealership. During motorway cruising, the engine management light had repeatedly come on, so on Saturday I took it to the garage. They apparently connected it to the tech2 computer which diagnosed a faulty airflow meter. They replaced the meter, and when I collected the car and handed over the £200, I asked if anything else had shown up on the tech2, and they told me nothing had. Today, the first day I've done some motorway driving since, the engine management light again iluminates. I can't take the car back until later this week, but assuming that when I do, they say that either: This is a completely unrelated problem caused by another component or This is a airflow meter related problem, but was perhaps the wiring or connector What is my chance or being able to argue that the new air flow meter was completely unnecessary, and that it shouldn't have been replaced? Is it complicated by the fact that they've presumably binned the old one? Any comments much appreciated! Paul.