got an astra 1.6 with the x16sz engine. had an overfueling problem for a while with no ecu warninglight. i changed the lambda and many many otherthings, but today i though id disconnect the lambda wire to see if it made a difference. it didnt, and i got no warning light telling me it was disconnected. does this sound right? shoud it bring a warning light? the engine was up to temp and i left the car idling for 5 mins, revved it a couple of times. checked codes and none were stored. any help appreciated. also it logs codes for any other sensor unplugged.