Question about Mercury Mountaineer
PO 430 --Catalyst System Efficiency Below Threshold (Bank)
Most likely a worn out exhaust converter
They should last 12 years or more,so you got or
have had, years of problems your unaware of that
You need to find out why & correct those issues,
then replace both converters.
These type of things happen, because people just
drive a vehicle until problems arise.
No testing or checking for proper operation throughout
the year & no preventative maintenance
Posted on May 22, 2011
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Posted on Jan 02, 2017
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