Yes the engine control module will be pretty fast to throw a code on any of the sensors, and yes I think you are on the correct sensor. I'd slow down a little to fault the front sensor, more than likely it's the sensor itself, I would tend to think along the lines of a bad cat (not operating efficiently) before I'd fault the front sensor. If the front sensor is junk you'll get a code for it, don't worry about that! I'd plan on the rear sensor sometime. Problem with disconnecting the battery is now you've lost misfire recognition, need to relearn the crank angle sensor adaptaion, don't know if I have the instructions around here for that or not, you can adapt it yourself but won't be able to prove it's adapted properly without an SDS computer or the like.
Gilly
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