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CEL Code P0420

wdgross06

Member
Joined
August 13, 2004
Messages
10
Reaction score
0
City, State
Chesaning, Michigan
Year, Model & Trim Level
'96 Sport
My CEL just came on the other day and fortunately I have access to a scanner and the only code present was P0420- Catalyst Efficiency Below Threshold (Bank 1). I have a '96 4.0. Is this my catalytic converter? How can it be fixed?
Thanks in advance. :D
 






It could indeed be your catalytic converter, or your rear oxygen sensor has failed.

Search for catalytic converter testing.
 






testing the backpressure is the best way to find out if your cat is shot. Or to bang on it to see if anything rattles.

-Drew
 






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