No idea what the problem is, but from what I've read about the KV6 if the ECU sees any fault from the crank sensor it prevents the car from firing. That info was from a Freelander KV6 manual, but I imagine it is the same for any KV6 regardless of which car it is mounted in. I think from memory, if it detects a fault with the crank sensor while the engine is running, the ECU also shuts the engine down too. Could be a problem with teh sensor itself, or the wiring/connection to the sensor? There have been a few threads in the past on several MG sites, where people have said "car won't start" or "car cut out", and advice has been to clean the crank sensor. Apparently it can become dirty within the housing and a good clean can help. No experience of this personally, but just relaying info that may help...assuming it is true, of course!
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