jfo53

After 2000 miles since new, it was time to reboot the On-Board Diagnostics computer. The result has been smoother engine running, 5-10% mileage improvement, plus sharper and more responsive transmission shifts. The reboot works with any OBD car and this trick can be found on various forums (originally found it for Porsche and used it on a 996). The OBD sensors provide input for "learning" how to apply the hard coded programs. It takes at least 2000 miles for the break-in of the engine and transmission parts. The OBD continues to use the same sensor inputs it "learned" when the car was new. The idea is to erase the memory of those out-of-date inputs by disconnecting the battery. The OBD then "relearns" with updated sensor inputs and the car starts to run the way it was intended. Just go to the trunk and disconnect the negative strap of the battery for more than 5 minutes. Then replace the strap, and reset the clock. That's it. Have fun.

mrtesting

Hmmm interesting!

hhughes1

Plan on putting all your outlook contacts back in after you're done.

shaker

Do you also lose all of your pre-sets programmed, such as seat positions and all the radio, including satellite settings, and any settings that you saved in the GPS?
Not a biggie as I am sure that re-setting from some recent 'soft' driving is more benefecial, but just wondering what we will be faced with afterwords??

GMW

I remember resetting the transmission/driving style memory by pressing the accelerator pedal all down (as if engaging kickdown) and keeping it down as you turn the key to position 2 then wait for like 2 minutes then turn the key back to position 0. All the while with the pedal all the way down. Then wait another 1 minute then remove the key, get out of the car and lock it with the remote and wait for another 5 minutes before getting in and feeling the difference.

Once you get in the car feels way more faster as the shifts are quicker too. Basically, driving slow or always stuck in traffic jams makes the transmission learn that you are a slow driver and therefore it will behave accordingly.

Disclaimer (before anyone gets too excited):
I have only used this on non-AMG Mercedes-Benzes that all had the electronic throttle. Which is basically all new Mercedeses. I don't know if this also applies to AMG models.

yazid

hmmm... interesting.. maybe i should try that out..

lee7758

Is that work for other AMG cars??

Merc-Skycap

Wow I didn't know there were rituals with this thing.........

Let us know how it goes yazid....

Quadcammer

this is ridiculous. The car constantly adjusts the fuel trims depending on the current inputs that the computer sees. Unless you had something like an exhaust leak, intake leak post maf, or other issues that would throw the fuel trims way out of whack, all this will do is reset the fuel trims back to factory settings and the learning will begin from there (they shouldn't be terribly different if the engine/emissions system is working properly).

While it won't hurt to try, if you think its going to be a big difference, you will be disappointed.

Arclight338

I wouldn't. Just go out for a couple of hours and run the **** out of it. It'll relearn to some degree,without the bother resetting so many useful piles of data.

GermanCars

Disconnecting the battery is going to set undervoltage fault codes in a bunch of control units. That is going to make it harder for a tech to diagnose a future problem you may have. Not to mention potentially damaging voltage spikes. On older Mercs, you also lose your personal presets, power window, sunroof, and steering wheel angle intializations. All and all probably not the best of ideas.

TA-9FF

I've tried that several times on my W203.

I don't know if it's just a placebo, or if the car actually responds better.

I'm also curious if this applies to AMG models....