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EMRSR, Master Certified Service Manager
Category: Ford
Satisfied Customers: 3010
Experience:  20 years with Ford, Master Certified
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2005 ford focus zx5: engine light..code reader reads..below threshold

Resolved Question:

have a 2005 ford focus zx5 engine light is on , code reader reads the following po420 cat efficiency below threshold bank 1
Submitted: 7 years ago.
Category: Ford
Expert:  EMRSR replied 7 years ago.
If the upstream HO2 is functioning correctly it is likely the catalytic convereter has failed. The cats carry an 8year/80,000 mile warranty. Of course there could be other issues but untill the upstream HO2 is monitored you can not tell.graphic
Customer: replied 7 years ago.
how do i monitor the upstream H2O
Expert:  EMRSR replied 7 years ago.
You would net a scan tool such as a Snap-On Solus, or a Ford IDS unit that can monitor the PIDS. This is a tool that is alot more complicated than the code readers that Auto Zone will pull codes with for free.
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