This code is a NOx Exceedance code which deactivates the EGR causing the engine to go to limp mode.
https://www.2carpros.com/articles/reduced-power-limp-mode
A couple of questions with this, now that you have deleted the EGR you need to either undo that alteration or find a tuner that is capable of having the PCM ignore this code as well as the other emissions codes that you get with EGR issues.
However, the likely cause of this is the fact that the engine is producing too much NOx and so it forces the engine to limp mode. What this means is, NOx is a harmful emission that is a byproduct of diesel engine combustion, and it can no longer be emitted to the atmosphere.
If you remember when trucks would put out black smoke, that contained NOx.
So, the PCM on your vehicle thinks that the engine is producing too much and so it shuts it down.
This means you have either a mechanical issue and you truly are producing too much. This would be sticking or damaged injectors dumping too much fuel. So, when was the last time you changed your fuel filters? This is crucial with diesel engines so if you have not changed them then you need to do that. More than likely if the injectors are damaged so this will not fix it but if they are not then that will prevent them from being damaged.
Next, we could have a faulty Oxidation Cat Converter. This is the converter that will convert the harmful emissions into non harmful. Basically, it has a ceramic coating that has a chemical reaction with the NOx and changes it into non harmful emissions.
However, if you can restart the engine and this does not reoccur then this is likely not the issue.
The PCM may think it is due to the sensor failure which is what I think this is. So, when they replaced the o2 sensor, what was the part number?
Let's start with this and go from there.
Thanks
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Wednesday, June 8th, 2022 AT 4:19 PM
