Right the first possible problem is, after reading about the 'pedal test' I gave it a go on my 1.8 2001 astra coupe and it's come up with P0170 which is Fuel Trim Malfunction (Bank 1), the engine management light isn't on and hasn't come on in the 3 weeks I have owned the car, so is it something I should be worried about, and if so what could it be?
The next possible problem is the temp gauge is only working sometimes. I go for a drive and it doesn't move, but if I turn the engine off and back on the gauge goes straight to around 80 (about a quarter the way up). I'm guessing this inst the thermostat and may be a sensor problem, and if so where would it be located? If im honest I haven't looked for the sensor or the thermistat yet, but I cant find a coupe manual so any clues where to find them?