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Besides a defective catalytic converter, what else may cause the p0420 and p0430 codes to show simultaneously ? May they be caused by a dirty MAP sensor ?

Thank you, and have a nice day !!!

Vehicle: 1997 Ford Taurus 3.0 L OHV

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Bad gas could cause that problem. Before changing the catalytic converters try using high octane (above 90) for a few weeks.

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