my mk 3 1.8 astra gsi s ecu light keeps coming on at 5k and acts as tho its rev limit is set there below 5k it drives fine. Ive had it plugged in to one of those computers with the diagnostics and it comes up saying its the crankshaft sensor but my mate says it sounds more like a cam shaft sensor as if was crankshaft sensor i would have problems starting it which i dont it starts fine and as both cost £60 from vaux id rather not buy and replace something i dont have to.
Could it be the crankshaft sensor causing the problem ?