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Here goes.. In November of 2020 the truck had a Check engine light (CEL). I took it to Autozone and borrowed their Scanner and it said After Treatment related to Nox Sensors. So I took it to the Nissan Service Department where I purchased it from, and was told it was a SCR failure (Catalytic Converter) based on what the tech found online and the cost to replace the component was estimated at $4000.
I told them I would be back someday. I was concerned I may not make it home before Limp mode... but I did. I took out the Nox sensors, soaked them overnight, and then cleaned them off with carb Cleaner. I reset the CEL and test drove... thinking and hoping the problem was only a dirty Nox Sensor. However, 29 miles down the highway the CEL came on. So I looked online for a place to clean the SCR, found a place that does DPF's, called them and was told what causes that in a Mercedes is when the Turbos go out and contaminates the emission systems through the exhaust, having transported the excessive oil and such to the exhaust or emission systems. Mercedes acknowledges that and when the turbo goes, they send the systems to this company for cleaning.
I told Nissan that they owe me a repair for the system. They said it is not in their manual so they will not do it. To me it makes perfect sense to clean any component downstream from a failed component, especially a downstream filter and components after that unless the filter will filter to the micron level... which DPF does not... so any contamination from the failed Turbo and also a failed EGR cooler would have severely contaminated the components in the system. It was just a matter of time.
According to the company that does the DPF cleaning, Mercedes knows that, and it is why they cover it. Nissan warranty book says they do not cover emissions for Diesels in states that have no emission testing, which is about half the USA..
- Funky T.,
Taylorsville, KY, US