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I experienced the same symptons, engine randomly cutting out, once just outside the M25 tunnel, and I too learnt that you could carry on by switching the ignition off and then on , without even stopping.
I eventually traced it to a poor pin connection in the 15 pin plug between the chassis loom and the engine loom, found by having the engine running and gently wiggling this plug in a certain direction, then you could hear the ignition relay trip out, so cuting the engine, then it would immediatley restart until another wiggle.
I couldnt imagine a cheaper looking 15 pin plug!
Hi Paul,
Thanks for your advice ! This could be well the case with my car as well. Will investigate it like you explained.
Once more this shows that the experience and knowledge of our forum members outweighs that of MMC 😁