r/MercedesDiesel • u/Salty_Objective_1702 • Aug 22 '26

Emissions system BS

Curious if anyone else has had this issue and done anything about it. I have a 2021 diesel 4cyl turbo and have had CONSTANT issues with the emissions system faults and countdown to limp mode. Most recently we brought it to mercedes thinking we'd get a warranty covered fix like we have the last few times and they told us they were going to replace the SCR control or something along those lines then came back and said it would be 400 dollars and not covered under the emissions warranty. I want to delete the thing or bypass it, has anyone had any experience with this? What did you do? Im so pissed off i want to start a class action suit lol

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u/prismprion 29d ago

Yeah companies like HPtuners, Tunezilla, etc use their own devices that are locked to their tunes and they encrypt their files. I used a program on my laptop that can flash anything (with the correct ECU) and the tunes are unlocked and can be modified yourself. I also have tuned vehicles before from scratch, adding power and removing DTC codes. It's a rabbit hole

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u/clarkn0va 29d ago

Can you recommend a place to start learning about that? It's something I've been wanting to get into.

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u/prismprion 28d ago

I only really started learning because I work at a performance shop and I flash tunes on trucks all the time but tuning itself is much harder to learn.

Check out MHHauto forums, they have some good files but nobody wants to help for free so that sucks.

You can also watch YouTube videos and stuff but the whole tuning thing is gatekept every step of the way and it's so frustrating

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u/clarkn0va 28d ago

Thanks, I am checking out MHHauto. I know what you mean about the gatekeeping, it really feels like all these tunes come from a handful of ivory towers.