2012 Cascadia with 280K Multiple fault codes Please Advise

04-27881 is not valid parts number. I have in my garage 04-27881-000(this is the number of header assembly for epa10 truck ) and that header does not have DQS. that's my 2012 freightliner's header

 

The 04-27881-000 is the analog header. Noted by it's triangular housing in the middle.
The 04-30240-000 is noted by the external connector because of the CAN based controller built onto the header.

My parts guy found built dates of late 2012 making them MY2013 but went back to analog soon after. He also found a shuttle bus that used a DQS. Both the P/N mentioned above are WEMA supplied headers. The shuttle bus uses a SSI technologies header with a DQS. This looks to be one off and used only on a few select vehicles.

I'm trying to find pictures to show examples.

I'm not a parts guy--I just know how they look.

 

I have seen slightly different header. the top portion was bigger and there was cable coming out with connector at end. I guess that is the CAN controlled header with DQS. I was thinking WEMA has improved header(no more cold leaks from valve). Now I know its another bad device installed on truck. I hate all digital/electronic devices on trucks. in general they are troublemaker.

 

Correct! The WEMA analog header has the connector built ONTO the header in the triangular shape. Like this:


Then the CAN based DQS has a pigtail out of the harness. I cannot find a picture on google...very frustrating...but my parts guy can look up the diagram easy. Anyway, kinda like this (this isn't an FTL part):



Needless to say, thanks to NAVISTAR, they accused FTL for being able to put water into the def tank and still "pass" emissions because there wasn't any way to determine how much urea was present (even tho this is not the case), hence, DQS.

http://www.ttnews.com/articles/printopt.aspx?storyid=24835 -- NAVISTAR's poor attempt to undermine DTNA and the use of DEF. A little bit comical when the company CEO thought he could be emission complaint solely with EGR.

http://www.eenews.net/stories/94513

http://www.eenews.net/assets/2010/08/19/document_gw_01.pdf -- Then you can see DTNA response to NAVISTARs accusation.

Anyway, the DQS units are VERY expensive because of the built in refractometer to monitor DEF quality. But there are ways to calculate quality without using an expensive sensor.

 

the analog header is not cheap. it's around $1500. the digital version would cost x1.5-2 more...

 

Anything aftertreatment related is EXPENSIVE...maybe a temp sensor is the cheapest thing...lol

 

How much are you hauling while getting 6mpg?