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How do you fix a 2001 Lincoln LS p0420 catalyst system efficiency below threshold Bank 1 it was run through emission and failed?
Wiki User
∙ 16y ago
replace cat May not be the catalytic converter. This engine code can be triggered by any one of the following:
1.) The catalyst in the catalytic converter is cracked, clogged, or otherwise damaged.
2.) The secondary O2 sensor is malfunctioning.
3.) There is an exhaust leak.
4.) The computer unit is faulty
Wiki User
∙ 16y ago
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