NOx Sensor Replacement - Chevy and GMC Duramax Diesel Forum
11-16 LML Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission, Etc.

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post #1 of 36 (permalink) Old 08-17-2013, 10:47 PM Thread Starter
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NOx Sensor Replacement

Just wondering if you can replace these sensors yourself or does GM have to do it?

Have not been able to find anything on about doing it so was just curious if you could replace them yourself. Am starting to have problems and suspecting it to be this problem.

Just looking for some general knowledge on the issue above.

Thanks!!!
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post #2 of 36 (permalink) Old 08-17-2013, 11:11 PM
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Quote:
Originally Posted by bfamilycattle View Post
Just wondering if you can replace these sensors yourself or does GM have to do it?

Have not been able to find anything on about doing it so was just curious if you could replace them yourself. Am starting to have problems and suspecting it to be this problem.

Just looking for some general knowledge on the issue above.

Thanks!!!
Whats the problem?

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post #3 of 36 (permalink) Old 08-18-2013, 08:05 AM
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Could question and it would be good to know once the truck is out of warranty. Looks like they run about $130. There's probably some reprogramming to do after a replacement. Let us know if you find out. I have had one replaced. Phillip

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post #4 of 36 (permalink) Old 08-18-2013, 08:19 AM
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The mechanical part of replacing the sensors is not a big deal. I can't tell you if there is some sort of recalibration that needs to be done using the tech II.

The 'sensor' includes an approx. 25" harness to a square metal piece that bolts to the truck and has the connector to mate to the truck harness. Presumably there is a small circuit board in the metal piece. The block for the sensor at the back/top of the motor is on the LHS of the firewall. The block for the DPF sensor is frame mounted.

They are about $380 each (in Canada).

If you've still got warranty, u you might as well use it.

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post #5 of 36 (permalink) Old 08-18-2013, 01:48 PM
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It looks like I am going to have to have the NOx sensor replaced. Does anyone know what the going price is?


Well. never mind. I added DEF yesterday and drove about 20 miles with nothing happening. This afternoon I went out to get pizza and the light cleared. Hopefully it really was just some bad DEF.

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post #6 of 36 (permalink) Old 08-18-2013, 03:31 PM Thread Starter
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Here is the current problem I am having and is the reason why I asked this question last night when I was on here last.

Went last week to get check engine light checked to see what it is and part guys said it was generic code and one that he did not have in his scanner and also when he ran it through the computer.

Have done some looking around but have not been able to pin point an exact diagnose on what this code is.

Also, before the light came on have been getting Diesel Exhaust Fluid Poor Quality, Please See Owner's Manual.

This light has been going off and the check engine light has been coming on. After awhile the check engine light goes off and I go about three or so days before the DEF light comes on and then the check engine light a few days later.
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post #7 of 36 (permalink) Old 08-18-2013, 03:33 PM Thread Starter
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Also, info on truck at this point 2011 with 45,700 miles.

Problem I am going to run into is the dealership around here is open till 5pm M-F (west central Illinois), and starting Tuesday I am working 7 days a week till the 2nd week of October (starting seed corn harvest) and need my truck on a daily basis. Which it has all the tools that I will need. Problem I see happening is that the dealership will not be willing to loan me a loaner truck to use to carry the tool box and other needed equipment.
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post #8 of 36 (permalink) Old 08-18-2013, 07:20 PM
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Dealer should be able to schedule you in to minimize downtime. You'll probably lose less time than doing it yourself.

It only takes minutes to read the codes with a techII.

Don't let the technician remove the sensor(s) unless the replacements are in hand.

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post #9 of 36 (permalink) Old 08-18-2013, 07:21 PM
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Originally Posted by bfamilycattle View Post
Also, info on truck at this point 2011 with 45,700 miles.
That's about the mileage when mine needed to be changed.

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post #10 of 36 (permalink) Old 08-18-2013, 09:29 PM Thread Starter
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Alright thanks for the help. Need to call dealership and see what they say and go from there.
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