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Check engine light keeps coming on...

1048 Views 3 Replies 3 Participants Last post by  redsail
...when I turn the ignition on for the first time. Switch off and back on again and the engine light is off. Repeat.

Any ideas what might cause this?
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It stays on when engine is running yes. Until you turn off and back on. Same if you don't actually turn it over.

It started happening infrequently before I fiddled with the flapper valve (during my track day). It COULD still be related to the flapper of course, which would mean it coming on previously is a mystery. It was behaving the same then, coming on every alternate switch on though.
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