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cat efficiency code
Have Caravan that keeps setting P0420 cat efficiency bank 1. New plugs, wires, OE 02 sensors, new cat, (aftermarket). No leaks, no discoloration, no smoke. This is not my forte, can someone point me in a direction? Thanks. Login to read more. 
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| Engine | 3.3 L |
| Trans | 4-speed Automatic (Electronic) |
Vehicle Data
2007 Dodge Caravan 3.3L
| Engine | 3.3 L |
| Trans | 4-speed Automatic (Electronic) |
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