Share
Ask OBDII Question

17,972 questions

9,258 answers

623 comments

4,275 users

Top Users

Reynaldo (3356 Points)
OBDIITech (2471 Points)
G37driver (2439 Points)
milonajo1 (737 Points)
OBDtech2 (165 Points)
corvette-78 (127 Points)
knowledge 1488 (124 Points)
Samat Bekov (117 Points)
ptl (113 Points)
sabtele (112 Points)

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 (2,471 points)
...