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 I have a 1887 code what could it be?
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Posted - 08/22/2023 :  1:04:06 PM  Show Profile  Send valleybusman an AOL message  Reply with Quote
Have a 2012 Bluebird all American RE changed fuel filters. Bus was lacking power. We got a NOx sensor warning code and replaced the sensor. Test drove bus and it wouldn't go over 20 on the hills. Brought bus back. Now we got an 1887 and was telling me it had issues with the SCR. Could I have a bad NOX sensor ?

Edited by - valleybusman on 08/22/2023 1:48:31 PM

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Posted - 08/23/2023 :  09:56:50 AM  Show Profile  Reply with Quote
1887=Aftertreatment Outlet NOx Sensor Circuit - Voltage Below Normal or Shorted to Low Source
so issue with nox sensor or wiring

Conditions for Setting the Fault Codes:
An internal circuit error has been detected in the aftertreatment outlet NOx sensor assembly.

so either not plugged in correctly, internal fault in the sensor , shouldn't be an issue with data link or the scr can but could be power or ground , there is relay and a fuse for this nox sensor
Possible causes of this fault code include:
The aftertreatment outlet NOx sensor has malfunctioned or is damaged
The aftertreatment outlet NOx sensor internal heater has malfunctioned
The NOx sensor part number is incorrect.
hope this helps all my info comes from the trouble shooting provided by Jpro , checked quickserve and trouble shooting is the same

OEM trained in wiring and all engine platforms for over 20 years
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