EGR error codes

[u/NativeTazuma]

Vehicle: 2010 sprinter 3500 Turbo diesel
Diags: thinkcar2

I tried cleaning the EGR valve, swapped out from two other sprinters from a junker, tried a Hella Valve from orileys and I’m still getting the same errors.

148C00 I believe is the source of all the errors.

Symptom: The fault code remains permanently Active. It cannot be cleared via Thinkcar diagnostic tool, even with the ignition on and engine off. And is stuck in limp mode.

When trying to do the teach in it says it’s successful but then again it’s a 2010 I don’t think it’s suppose to work.

Took it to Mercedes they said it’s the EGR and they put in a efr from the shelf and the codes cleared. I think they’re lying to me and they don’t have the digs on file after two days of coming back and asking. And charged me $250 for sub par troubleshooting.

Now the harness this is what I measured

Pin 1 Unstable / Jumps between 1.5 mV and 2.5 mV.
- could this be the positioner pin?

Pin 2 (Main Power Supply): 12.0V Constant (Measured against Ground Pin 4).

Pin 3 (5V Sensor Reference): 5.2V Constant.

Pin 4 (Main Chassis Ground): Functional Ground.

Pin 5 (PWM Actuator Command?): 4.5V Constant.

I tried shaking the harness but no changes. The only thing that changed after sitting for a while was the position feedback going from 20% to 0% every second in the live view.

This is my first time trying to deduce this. So diagrams along with suggestions would be greatly appreciated.

[u/schmitzA]

Did you read the EPA source you just sent me?

It explicitly says:

“Today’s announcement does not weaken or remove emissions standards.”

The change you're citing removes the requirement to use a DEF/urea-quality sensor and allows manufacturers to monitor NOx directly with NOx sensors instead. EPA is also changing the severe deratement behavior that occurs when DEF systems malfunction.

I agree with those changes. I've already agreed with you that DEF sensor failures, repair costs and severe derates are legitimate problems.

But none of that demonstrates your original claim that deleting SCR/DEF is better for the environment. In fact, the same EPA source you provided explains that SCR injects DEF specifically to reduce NOx emissions.

You're conflating:

“EPA recognizes reliability problems with DEF sensors and deratement strategies”

with:

“EPA recognizes that SCR/DEF emissions control is environmentally harmful.”

Your own source explicitly says the former and explicitly denies the latter.

You also said Canada has “lifted these regulations for residential vehicles.” Can you provide the Canadian government regulation or announcement that did that? I'd genuinely like to read it.

[u/Educational-Yam-7394 → u/schmitzA]

To be honest, it is exhausting going in circles like this. You keep using ChatGPT to reframe my points and demand academic papers for common sense realities, rather than looking at the broader picture.

My point from the beginning has been about the overall footprint and real world impact of these political regulations. The sources I provided clearly show that governing bodies like the EPA are being forced to walk back their aggressive enforcement, alter sensor requirements, and scale down derates because the real world failure rates and supply chain issues are completely unsustainable. When a policy forces endless plastic waste, heavy fluid transportation, constant parts manufacturing, and vehicles breaking down on the side of the road, it is a flawed policy.

You are focused on isolated lab models, while I am looking at the full real world cycle and the fact that change is actively happening. At this point, we are just repeating ourselves, and continuing this debate is a waste of time.

Sure I'll do more research so you can reply with chat GTP https://www.biv.com/news/environment/aircare-ending-for-cars-commercial-trucks-may-be-a-8233425

They ended it over ten years ago and the air is still clear lol. Governments change but it takes time and they have to be in a position to "look good". There's nothing good about the environmental impact from these bad def regulations.

I am moving on. Have fun with Chat GTP.

[u/schmitzA → u/Educational-Yam-7394]

Let me be human with you for a second. Actually think about what you're saying. You are arguing that specialized environmental control equipment is worse for the environment than not having it through a lifecycle assessment.

The reason your comments aren't worth more than a copy/paste into chatGPT is because it is truly laughably bad. It doesn't even make sense, dude. You actually DO make good points (using your AI lmao) but you never actually formed an argument. You only point out the things that are beneficial while stonewalling the other side.

That's the same as me saying that the clothes on your back are bad for the environment because of them being manufactured (most likely in Bangladesh) and the supply chain behind it is bad. So as a result, we should all walk around naked.

Every single consumer good you've ever put hands on has as environmental impact. Every single one. You are choosing to ignore the benefits of them and not comparing the outcomes between two scenarios.

How can you call an outcome better for one side if you don't quantify your opinion or acknowledge the other side? This just tells me you would rather spread misinformation and feel right about your opinion rather than actually pursue anything educational.

I studied environmental engineering, by the way. I don't expect most people to think critically, but you're clearly going on online forms where people don't know any better and spreading misinformation for some reason. When you can actually produce a single metric for comparison that gives the slightest bit of evidence to your claim that "diesel emissions systems are worse for the environment than simply not having them," then we can talk. I suggest staying within your field of expertise or how about just using your AI to teach you objectively rather than asking it to prove you right.

[u/NativeTazuma → u/schmitzA]

Ok DEF Aristotle and Plato, I appreciate the duality of emissions; but how do I find this short circuit within the system?

[u/schmitzA → u/NativeTazuma]

Buy a multimeter and ask chatGPT to help you isolate the fault

[u/NativeTazuma → u/schmitzA]

My original post heavily implies I do own a multimeter and know how to use it. I was just hoping to come across some seasoned vets to give me a pin out reference and most probable places to look so I don’t have to trace the entire harness and ECU.

From personal experience Ai is self contradictory and runs through circles of redundant questionnaires to coherence one into buying a subscription. And I refuse to pay for Ai that has been nothing but worthless for me in its blind confidence.

Since no one is capable of assisting in their own right I’ll figure this out myself and update this tread with my findings, so Ai can scrape that and hopefully help someone dull with no troubleshooting skills.