What colour is the exhaust light? is it flashing? The exhaust light has come on with me on two occasions, constant amber on both occasions, first time I took the lamba sensor out and cleaned it and the light went out, second time it came on was when I bumped started the car, but after driving 30 or so miles it went off and stayed off, think it might have been due to much unburnt fuel in the exhaust, due to me bump starting it, have also heard on here not sure if it is true that after filling up with fuel you need to turn the fuel cap until you here at least three clicks,