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6 cly automatic xlt shows code p0420  need to cure proble4m for emissions testing
Vehicle: 2003 ford explorer xlt 6 cyl

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Hi there

Most of the time when you have this code you have to replace the catalytic converter to resolve it. This code means the converter is no longer working like it should to clean the exhaust. Sometimes a bad rear O2 sensor can cause this or an exhaust leak as well. This code is specifically for the bank 1 converter.

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