Volkswagen Jetta P Codes (Powertrain) P0400 - P0499 P0420

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2003 Volkswagen Jetta P0420 Engine Code

2003 VOLKSWAGEN JETTA
I Have 03 Jetta With Rebuilt Engine Just Installed And P0420 Code Pops Up. So I Replace Both O2 Sensors And New Cat. What Should I Do Next...
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Asked by basspro1978

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