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I Have the same code on 2012 volvo spn 4094 fmi 1 checked…

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I Have the same code...
I Have the same code on 2012 volvo spn 4094 fmi 1 checked and cleand def injector.
Submitted: 6 months ago.Category: Medium and Heavy Trucks
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Customer reply replied 6 months ago
Posted by JustAnswer at customer's request) Hello. I would like to request the following Expert Service(s) from you: Live Phone Call.
Customer reply replied 6 months ago
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Answered in 16 hours by:
12/1/2017
Technician: Eurotruck72, workshop foreman replied 6 months ago
Eurotruck72
Eurotruck72, workshop foreman
Category: Medium and Heavy Trucks
Satisfied Customers: 68
Experience: Expert on all brands of european trucks. 20+ years experience as workshopforeman and owner
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It might be the engine throws out to much NOx to begin with. Please check for leaking turbo-intercooler hoses, Egr system or dirty air filter. Does it start as quick as it always did? Leaking injectors make it start bad and can give this code.

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Customer reply replied 6 months ago
I will try that what about nox sensors
Customer reply replied 6 months ago
Starts good air filter good egr seems good. It called for a park regen 2 times in a week and the soot gauge was on the low end now says scr is in evaluation
Customer reply replied 6 months ago
code returns in about 2 min after cleared or started wont let me park regen temporary lockout
Technician: Eurotruck72, workshop foreman replied 6 months ago

Your code indicates bad SCR efficiency, not a DPF (soot filter)problem but the regen (is for the DPF not the SCR) twice a week is probably related. Maybe the SCR cat is clogged with soot or DEF crystals, that could cause this code. Can you see in the chamber where the def nozzle injects? Check for soot or DEF crystals. If possible run the engine without the dpf and check for smoke, it should only smoke a little bit, a dpf can not clean a heavily smoking engine.

Maybe the DEF fluid is of bad quality and as you said maybe a bad NOx sensor but both are not likely.

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Technician: Eurotruck72, workshop foreman replied 6 months ago

Have you come closer to the problem yet?

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Technician: Eurotruck72, workshop foreman replied 6 months ago

Please click accept if my advise was of help

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Customer reply replied 6 months ago
have not had a chance to look yet thank you
Customer reply replied 6 months ago
Can I bench teat a nox sensor?
Technician: Eurotruck72, workshop foreman replied 6 months ago

Without a diagnostic tool you can't test the NOx sensor. It measures the NOx and reports back to the ECu by can- bus. If there wasn't communication it would give that error and not the one you got. If you have a diagnostic tool you could test the def injector. You can make it inject a certain amount and then check if it did the correct amount. That would be the first test I would do now. Then try a test drive while looking at the values of the NOx sensor and see what they are measuring and if it show stable values and higher values at the entrance.

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Customer reply replied 6 months ago
I checked the def nozzle amount and it passed using a snap on pro link. I can not see the knock sensor. Cleared codes, now I get code #PSID 90-FMI 14 AFT SCR feed back control status.
Customer reply replied 6 months ago
sorry cant see the NOX sensors
Technician: Eurotruck72, workshop foreman replied 6 months ago

Did you need to clean the nozzle tip first or did it work right away? Probably worked fine, then I think the SCR cat needs cleaning.The code means low efficiency of SCR kat. Probably the SCR cat itself is not working correctly. Mostly that happens after a turbo failure or something like that. Did you have an issue recently? Have it cleaned by a professional company. You can buy all kinds of DPF/SCR cleaning sprays and liquids for it or dip it in accid but its beter done by experts.

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