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Dodge P0420: Troubleshooting Upper Catalytic System Efficiency | JustAnswer
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Had a P0420 code pop tonight (2002 Ram 1500) - DodgeForum.com
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Q&A: Dodge Ram 1500 P0420 Code - O2 Sensor Location & Wiring Diagram
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Q&A: Dodge Ram 1500 P0420 Code - O2 Sensor Location & Wiring Diagram
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Q&A: Dodge Ram 1500 P0420 Code - O2 Sensor Location & Wiring Diagram
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Had a P0420 code pop tonight (2002 Ram 1500) - DodgeForum.com
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P0420 โ Catalytic converter system, bank 1 -efficiency below threshold