txragtop

Greetings!

2012 Bluetec sedan, 113K miles. Due to a check engine light and check coolant level light, wife took her car to the dealer. $175.00 diagnosis fee and they want to change the DPF, all knock sensors, lower radiator hoses and serpentine belt and pulleys. $8000 as per below.

So....she decides it's time for a new car and buys a 2016 E 550 Cab with 15K miles. Instead of trading the diesel in, she offers it to me as she's always had the dealer do the work and much of it covered under warranty. I'm moderately mechanically talented, and would like to attempt fixing these issues myself but want to know if I"m getting in over my head. The car is at an independent Mercedes shop for a second opinion. I wanted the group's opininon of what to do next, how to confirm these issues are real and if there have been folks who have done the work before. Thanks in advance, I'm happy to post the story if I decide to tear into it.

Thanks in advance!

Chris

REPLACE DIESEL PARTICULATE FILER AND DPF SENSOR AND UPSTREAM AND DOWNSTREAM NOX SENSORS AND TEST AFTER

OBSERVATIONS:
DIESEL PARTICULATE FILTER HAS CURRENT CODE 111600 AND DPF SENSOR HAS CURRENT CODE B2818 NEED TO REPLACE DIESEL PARTICULATE FILTER AND DPF SENSOR AND UPPER AND DOWNSTREAM NOX SENSORS

$5,114.74

DRAIN COOLANT AND REPLACE LOWER COOLANT HOSE AND PIPE GOING TO ENGINE

OBSERVATIONS:
LOWER COOLANT HOSE CAME OUT OF PLACE THE SPRING THAT RETAINS HOSE IN PLACE IS WEAK NEED TO REPLACE HOSE AND COOLANT PIPE

$921.04

REPLACE BELT TENSIONER AND BELT AND IDLER PULLEYS

OBSERVATIONS:
BELT TENSIONER IS WEAK AND BELT IS COMING APART HAS A SMALL PIECE MISSING NEED TO REPLACE BELT TENSIONER AND BELT AND IDLER PULLEYS

$1,213.90

DeutscheBenz726

The DPF is an expensive item and has to be ordered with a very long backorder possible. The other things aren't hard but I'd get rid of it if I were you

kajtek1

Is the car DEF equipped?
If your live in non-smog required state, you might opt for DPF delete.
Plenty of info in diesel section.
Weak on those are idler pulleys, so I would inspect the tensioner and go with new pulleys and belt About $100 in parts.

deimosian

NOx isn't knock, it's Nitrogen Oxide https://en.wikipedia.org/wiki/Nitrogen_oxide_sensor

There's no knock sensor on any diesel because knocking is only a problem on engines with spark plugs, it's when combustion happens spontaneously when it's not supposed to without a spark.

In a way diesels are always knocking, that's just how they work.

Ashoke Roy

That's an interesting idea for people like me - live in Ontario, Canada. The province, recently, has cancelled emission requirements. So I am thinking of this option of deleting DPF for my ML 350. It's giving me pain keeping check engine light on with almost normal driving. Looking for a mechanic in my area who can the job. It may not be cheap either, I guess. Replacement cost is close to $5K. If the delete DPF cost is up to $2K, I'll go for that. Here is an older article about DPF Delete. So the idea was floating around for some time. It was in grey area for legitimacy but with the new change of law, it's OK. Any thought?
https://www.trucknews.com/regulation...te/1002148784/
Thanks.

kajtek1

Every DPF delete reported on this forum comes with some kind of troubles.
So I would advise that as last option. In last year we did succeed in getting ScanGauge to make gauges for DPF. I keep 1 car original as now, when monitoring DPF with ScanGauge, I can run full regeneration and avoid cutting unfinished process. That seems to keep DPF happy.
I don't drive cars much, so it is not high-mileage experience, but I have high hopes for it.
Than the withe car in footnote has DPF delete and seems to burn more fuel. We drive it on different routes, so that might be the difference, but makes you scratching the head.

Ashoke Roy

Thanks kajtek1. How do you run full regeneration with ScanGauge? I have a device called icarsoft mb ii. It scans and shows filter/ash contents but don't see an option to run full generation in it or am I missing something?

kajtek1

ScanGauge does not force regeneration, but monitors it and gives you fill %.
So when I see the % coming close to 100, I plan on taking longer loop, so when regeneration starts, I don't stop the car till it finish. Takes 10 miles in city, so not that big deal.
MB II lied to me. I was forcing regeneration with it, what was pretty annoying procedure, when at the end MB II did show successful regeneration, only after reset everything was clog like before. That was with DPF having mechanical issue, so maybe it will work better for you.

Ashoke Roy

I found this video claiming that the device NexLink's Nexas can force to regenerate. Any idea? Thanks.

kajtek1

Would Freightliner scanners work on MB, that would be great, but I am not holding my breath.
Any volunteer?

Ashoke Roy

I got the answer of my own question.
That scanner doesn't support for MB regeneration (See screenshot).