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I have a 2001 406 estate (2.0 petrol) and have had this warning several times. Once it was a real fault, diagnostic analyser said it was the downstream oxygen sensor (P0136), and replacing the sensor fixed it. Other times the analyser just says "random misfire" (P0300), once it did this after accidentally stalling the engine and it just clears on its own if the misfire has gone away but this takes a while. Resetting the fault code speeds this process up. If the warning is persistent I recommend buying an analyser and seeing what the underlying problem is. Good luck. John.

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16y ago

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