Question about 2003 Ford Escape
Here's what the code means, P0420 -- Catalyst System Efficiency Below Threshold (Bank 1).
Causes: Bad O2 senor, bad catalytic converter, and/or leaking exhaust manifold.
The error is coming from the O2 sensor number 1 between the exhaust manifold and the catalytic converter. The sensor itself may not be the problem. From what your describing is maybe a leak coming somewhere near the exhaust manifold. This would set off the P0420 code. Look around the exhaust manifold down to the catalytic converter for leaks that will leave black marks from burned fuel. If this can't be easily found, you may have to take the car in and have the exhaust hooked up to a smoke machine. This will inject smoke into the tail pipe and any leaks will be found by the smoke coming out of it.
Posted on Nov 16, 2009
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Posted on Jan 02, 2017
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