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peter2019
Senior Member

125 Posts
Posted - 04/15/2019 :  10:17:34 AM  Show Profile  Visit peter2019's Homepage  Reply with Quote
Wired, early morning start school bus DT466, around 5-10 minutes later engine light came up and went off by itself 10 minutes after, then whole day no more engine light came up again. computer got code DTC421: Cyl1: low side to high side open(active/inactive), then I did injector buzz test, no code DTC421, but came up DTC425: Cyl5: low side to high side open. Anyone knows what's happened? Thanks!

eddo
Advanced Member

USA
311 Posts
Posted - 04/15/2019 :  1:41:36 PM  Show Profile  Reply with Quote
What year DT466? or more accurately, what year is the vehicle it is in?
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peter2019
Senior Member

125 Posts
Posted - 04/15/2019 :  3:34:11 PM  Show Profile  Visit peter2019's Homepage  Reply with Quote
year 2005 with EGR, eddo
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Bus Tech1
Senior Member

76 Posts
Posted - 04/29/2019 :  10:38:13 AM  Show Profile  Reply with Quote
This is when I pull the valve cover and check injector resistance. It`s normally time to replace them. I have had it go on for a long time and not even notice a miss but the resistance tells the tale.
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