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My wifes beetle just started messing up and i have no idea how to fix it. i plugged up an OBD reader to it and it gave me the below codes.

P0302 Cylinder 2 Misfire Detected
P0420 Catalyst System Efficiency Below Threshold (Bank 1)
P0202 Injector Circuit / Open - Cylinder 2

I talked with some friends and we thought it might be a fuel injection problem so i ended up replacing all the coil packs, spark plugs and fuel injectors ($500 for all that crap and still not working). can anyone please help with what might be going on. :confused: It is a 2002 New Beetle 1.8L Turbo GLX automatic
 

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Get a noid light tester and plug it to the injectors to make sure you are getting signal to them.
Do that test first so you can move to something else if this test passes.
 
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