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So Ive got a4 b8 CDNC engine . The check engine light came on and a scan shows this error msg. Trouble codes: P218700 - System too lean at idle, Bank 1 static Engine was recently out of the car for piston/rings replacement. I made a smoke tester and cant see any leaks, (...

So Ive had an occasional immobilizer fail ( light flashes car starts but wont run) I'm guessing its a problem with the rfid reader. ..Dodgy wiring?.. Its random ( about 6 months since it last failed) So whats the best way to fix this?