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1998 gmc jimmy po420

Possible causes. Catalytic converter 20k miles

Vehicle: 1998 gmc jimmy 4.3
asked Jan 30, 2013 by caterpillar (101 points)

1 Answer

Yes, P0420 it's probably caused by the catalytic converter.

P0420 GMC - Catalyst System Low Efficiency Bank 1

Read more: http://engine-codes.com/p0420_gmc.html

answered Jan 30, 2013 by OBDIITech (2,422 points)
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