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Anti pollution fault warning came on along with engine management light. Engine died as if ignition switched off. Engine restarted and ran perfectly but keeps dying without warning. Diagnostic tool showed P0230 code so changed fuel pump with no success . Engine also runs on momentarily after ignition switched off. Does anyone have any suggestions. I suspect a relay but cant find one.

Hi Vince & welcome aboard.

The most common problem is usually the in-tank lift pump. Can you hear it run for maybe 4 or 5 seconds each time you turn the ignition on?

Does it shut off completely randomly or when you have the throttle down?