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Richard, ASE Certified Technician
Category: Car
Satisfied Customers: 15522
Experience:  12 years Ford Lincoln/Mercury Jaguar dealership as a technician and shop foreman reparing all makes
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2000 Mitsubishi Montero Sport ES: Code reading P0421 - what does this

Customer Question

2000 Mitsubishi Montero Sport ES- Code reading P0421 - what does this refer to?
Submitted: 6 years ago.
Category: Car
Expert:  Richard replied 6 years ago.
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Richard :

Hello and welcome to

Richard :

99% of the time that code is caused by a faulty cat converter.

Richard :

That code is for bank 1 cat converter which is the one located on the passenger side exhaust.


Does this mean replacing the cat conveter

Richard :