FUEL IN OIL 2010 CUMMINS ISC 8.3

Okay I will check those supply lines with a headlight. Do you think that this could be related to the issue I mentioned previously about the fuse box? There is a fuse box under the hood driver side that has a couple relays, every so often the truck will show a "no eng" light on the dash, then the truck will crank but not start and the driver has to tap on those relays for it to start.

 

Thank you...yes its a Freightliner m2

 

Okay I replaced the wires under the fuse box that we had to tap on occasionally and it fixed the no start electrical gremlin problem we were having (it has been over a week with no issue).
Today the 3582 code came back along with 3543 which caused the truck to derate.

I replaced the doser & dpf ecm about 1.5 years ago. Should I go straight to the doser or to the scr pressure test? I went online and noticed people performing a scr performance test. I dont see the SCR performance test on my insite software. Is this test available on my engine year?

Thank you

 

scr code returned

 

Also this SCR has under 200,000 mile on it.

 

No neither nox sensor has ever been replaced.
I looked in the troubleshooting tree for 3543 and did not see anything that would say the nox sensors could be bad (did i miss something)? Are you thinking it could be a bad nox sensor? If so inlet or outlet?

Thank you

 

The electrical gremlin i had issue with before have been fixed as we have gone 8 days without the electrical issues we were having before. Thanks for the tip.