PACougar

Disclaimer: First of all this is for diagnostic purpose only!!! Second in most country's it's quite illegal to modify these on a road going vehicle, in fact in California it's illegal even if the vehicle is for off road purposes only. You should only use this to locate a problem and fix it.

You'll need a Dev mode SDS unit that's unlocked.


1. Select your car
2. Go to Control Units
3. Go to Drive
4. Go to MESFI 2.8
5. Go to Development Data
6. Go to Control Unit Adaptations
7. Go to Control Unit Adaptations(Variant Coding)
8. Go to Implizite Kodierung ME281 AMG C6-Stand

For EGR scroll down to 0176 and change Diagnose ein to Diagnose aus

For Secondary Air Injection scroll down to 0178 and change Diagnose ein Diagnose aus

For Post Cat 02 sensors scroll down to 0182 and change Diagnose ein Diagnose aus

That will disable each of those in the computer.

pearlpower

Interesting, I take it by doing so will show Not Ready on any Readiness scan such as smog? But would avoid codes otherwise.

PACougar

I actually need to find out. I'm hoping instead of showing not ready it doesn't show the parameter at all, obviously not all cars come with the same emissions equipment, so it may just not show it an available monitor.

BBBSS

If its like on GM's LS motors it should not even look to see if its ready or not. No check engine light, and should pass a plug in emissions test.

GT-ER

Awesome. What about evap?

Hulk

Very nice
Thanks!

DVC

The engine needs to be running for these settings to save.

shardul

iTrader: (1)

Yes that is correct

adianaty

This must be why I kept getting an error code when trying to turn off the O2's.

Thanks!

Hulk

lol

shardul

iTrader: (1)

For the V12TT
Secondary air injection code is 0235
Rear 02 code is 0239

Lawrence1

if you're lucky, this will likely make the ecu show "not supported" when hooked up to the CA smog equipment and yoy would pass. This might work for the egr and SAS.

My guess however is that you will fail since your o2 sensor monitors and catalytic will show not ready due to the rear o2 sensors being deactivated. You can only have 1 monitor show not ready to still pass.

The problem here is that even if you pass, the BAR/DMV could easily see that something has been tampered with if the results ever get flagged for review by their inspectors. The chances of this happening are very slim but they do exist, especially if the computer compares these readings to other e55s that have been tested.

Definitely keep us posted though as im curious how this turns out.

pearlpower

Interesting, each and every time, this: Yes, engine was on.

pearlpower

Step missing above-will post later, turned off rear O2s and so far no issues, and shows READY, not deactivated.

Hulk

Let us know PP

edin_sl55

On a 2003 Mercedes SL55 ME-SFI 2.8
0176 is for EGR and I set it to "Motor-Code E/A 1, AGR - Daignose aus"
0182 is for the O2 after CAT and I set it to "Motor-Code E/A 1, LS-hinter KAT-Diagnose aus"
0244 is for the Secondary Air Pump and I set it to "Abgas - Code, max. Einschaltdauer Sekundaerluftpumpe = unbelegt"

Now, the ultimate question is will these changes affect an ECU that has a specific tune coded to it or is this a diffrent part of the memory?

Hulk

O2 won't affect and the sec pump won't either
EGR not sure

edin_sl55

UPDATE: the settings did not stick as in the reset to just blank lines. At this point I'm looking to the experts to chime in why I wouldn't be able to program the module. SDS shows programming then complete but does ask me to switch off ignition as with other modules. Please help

Robert AMG

iTrader: (1)

I just did them in my car without problems, if you get blank lines you have to erase the faults in the ecu then go to develop data.

adianaty

Robert is right. The reason the engine needs to be on is because of the fault codes that are present when the car is off. If you clear the codes and then make the change, at least in my car I didn't need the car to be on even and it took it.

edin_sl55

Yes you are correct. I was able to easily modify the settings once I met the prerequisites.

Prerequisites to program module:
1. No fault codes exist
2. Engine is on (needed to read codes in)

I will drive the car today and verify if all of the readiness codes are set.

For those who are not familiar there is an option within the module to verify these before you take it in for testing.

SavMan

I changed EGR and Sec Air Inj, on my handheld scanner it shows Sec Air Inj as Ready but EGR as N/A. Not sure why they have different status double checked in Star which shows both are still off.

As a side effect my car runs richer when cold AFR's sit at 11-12 for the first few minutes, car also seems smoother on very light throttle situations.

Will put some more miles on it this morning to see if it was just a placebo effect and allow the car to get to full operating temperature to see if anything changes on the handheld.

SavMan

OK just returned from 50 mile round trip approx 14 miles mixture of town and 50mph the remainder was at 70+mph.

Scanner still reads the same EGR N/A and Sec Air as Ready, I did not touch my Post Cat O2 sensors I don't have any cats and it has always shown as Not Ready.

Car IS smoother at light throttle 1200-1800 rpm even my wife noticed and was still richer during warm up than normal (11-12 AFR).

Interesting side affect to add, I have had a map (B28) sensor error ever since I fitted an 82mm TB. No air leaks and recently had Jerry of EC adjust the voltage but still would trip when part throttle at circa 80+mph.

Tried to get it to trip last night and during my 50 mile round trip today and nothing, hopefully it will stay that way

benz_addict

I Like Soup

I did these three changes and took my car for a drive hoping to get a driving cycle out of the way. It was choppy while I was sitting at stoplights. Which of these settings would cause this? I was thinking to leave them all in "aus" position until I hopefully got through emissions.