Having problems with your 2000 Ford Focus ?

Po420 - 2000 Ford Focus

Posted / edited by AnonymousUser on : 26-07-2021

Answers :

P0420 = catalyst system efficiency below threshold (bank 1)

the computer is detecting that the O2 sensor downstream of the catalytic converter on the bank of cylinders that includes cylinder 1 is starting to mirror the same cross counts as the upstream O2 sensor. This usually means that the catalytic converter is worn out and must be replaced. However, the oxygen sensors must check good---a bad or "lazy" oxygen sensor won't give an accurate picture of catalytic efficiency.
Repair Help & Product Troubleshooting for 2000 Ford Focus

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