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Almost cut out fault 0420



  monaco 172
So today on my normal commute to work I came to a stop and dropped the clutch and the engine dropped to about 300rmp so I blipped the throttle and it came back to life.

Car pulls fine and there's no smoke or anything but the idle is pretty bad, seems worse than my old 182.

Checked The fault with my code reader and it showed 0420 which I believe means the cat isn't working correctly.

Could the 2 be related?
 


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