Engine Light

Asked by Sep 06, 2017 at 01:24 PM about the 2008 Ford Escape XLT

Question type: Maintenance & Repair

My engine light went on for my Ford Escape 2008
xlt I went to auto zone and the code they game me
was P0420. Can you tell me what's wrong with my
espcaoe. Thx

1 Answer

83,905

That is the trouble code for a failed catalytic converter. "Catalyst efficiency below minimum threshold." Before you replace the catalytic converter be sure that the engine is running correctly. Misfiring, burning oil, and internal coolant leaks are the most common causes of catalytic converter failure. A catalytic converter usually doesn't just "wear out". They can and do sometimes but more often than not there's an engine problem that causes the converter to fail. HTH. -Jim

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