code po420
#1
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code po420
I have a code po420 on my 01 bonneville,check eng light came on,seems to be low on power but not running rough,anyone else have this and can lead me to the problem thanks ahead
#2
Senior Member
True Car Nut
Check this out. It will help you figure out where you need to look OBD-II Trouble Code: P0420 Catalyst System Efficiency Below Threshold (Bank 1)
#7
DINOSAURUS BOOSTUS
Expert Gearhead
How can a sensor be the first check, when that is telling the computer there isn't enough of a difference from what the front and back sensors are reading?
Did a quick search and came up with the FSM info on this code.
http://www.gearchatter.com/viewtopic...ighlight=p0420
Did a quick search and came up with the FSM info on this code.
http://www.gearchatter.com/viewtopic...ighlight=p0420
Last edited by BillBoost37; 03-24-2009 at 01:07 PM.
#10
Senior Member
True Car Nut