Best Code reader/ Diagnostic Tool/to reset
Thanks a lot.
Last edited by Handyman101; Sep 25, 2022 at 04:42 AM.

https://www.fcpeuro.com/products/mer...tor-2035400053




FYI — all 2003 (also 2004 & 2005, I believe) W211 cars, 4matic and RWD, had 722.6xx 5Gtronic 5 speed transmissions. Every 722.6 transmission I’ve had regardless of subtype also had the leaky connector. If you do any service on the transmission, replace the connector.
Anyways, either 70 or 90 pro, I am gonna try to see if I can get rid of limp mode (as my priority issue) and leave the result here and if no luck then I buy some of the brands you guys recommended from amazon and hopefully they have refund policy?!
Finally regarding fixing it, I did a whole week online research in the past and it seems the most cause of the limp mode is the conductor plate?!
Which I am gonna take care of that in the new year and I will take the car to Mercedes for diagnose as average Joe mechanics have no clues...I have watched lots of youtube clips people have been changing the conductor plates and the connector and still have the same limp issues , so I am not gonna waste my money and time for troubleshooting and changing parts...
cheers.

For battery problems, the usual list is the battery, alternator, aux battery or battery control module in the case of your 2003, they got rid of the battery control module in the face lifted models which was 2006/2007+. It's also picky about the alternators in the early years too, there may be several that fit so be sure to look up the right part number in EPC. I would guess aux battery first which is used for SBC brakes and then if that's not it, it's the battery control module. You can just have the aux battery load tested to see if it's good or bad. Most stores in the US will do that for free, no idea where you are or who would do that.
Not that up on my transmission error codes, says speed sensor or some electrical problem with the speed sensor. That's why I thought about the connector. That's the easy and cheap thing to try first, might be due for a transmission fluid change anyway. Anyway, yeah lots of times a conductor plate replacement will fix it too and you can send them out to be rebuilt which will save you the trouble of having to recode a new one. But first check the coolant/transmission fluid. The 2003 year models were known to have bad radiators and the transmission fluid and coolant mixed. I would think that if you're driving it now, the radiator got replaced by now or you were super lucky til now. Lots of old threads about checking the name on the radiator to see if it was replaced or not.
Last edited by bsmchugh; Sep 26, 2022 at 02:30 PM.
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Anyways, back to battery:
1) Main battery replaced a week ago. ( It was below 12 volts)
2) Alternator is good because it does its job and I get 13.71 volts. I do not get "ALTERNATOR VISIT WORKSHOP" message on the cluster.
It is just after car sitting over night, I get RED battery icon on the cluster !
3) Aux battery needs to be replaced ( below 12 volts)
However, I am gonna ask MB dealer if I need to rest the computer for battery change after changing both batteries?!
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I am aware how much dealers charge people....If that gonna cost me arm and leg, I will sell the car as is...life too short to suffer and waste money on a "car".
Seems still Cavalier is the best choice out there....lol
Last edited by Handyman101; Sep 26, 2022 at 04:15 PM.
Took the car to my Transmission guy, he hooked up his $ 5000 SnapOn scanner and reset the computer ...test drove the car, it was nice and smooth but on further stop and drive car gave me couple of kicks and ENG light appeared and back to limp mode. My transmission guy told me your conductor plate is shut ! Resetting won't help any more even as a temporarily fix...
The plan is:
Take the car to MB dealer for diagnose and confirmation ONLY and decide from there...
PS. I will return the $ 200 scanner as with its fancy bigger size LCD screen, etc etc it did the same job as my $30 code reader and nothing more....btw I am wondering if icarsoft MBII V2.0 for Mercedes which I hear a lot, won't be able to reset codes so why bother to spend
$ +/_ 300 for a code reader ?!)
Last edited by Handyman101; Sep 26, 2022 at 03:29 PM.

Anyways, back to battery:
1) Main battery replaced a week ago. ( It was below 12 volts)
2) Alternator is good because it does its job and I get 13.71 volts. I do not get "ALTERNATOR VISIT WORKSHOP" message on the cluster.
It is just after car sitting over night, I get RED battery icon on the cluster !
3) Aux battery needs to be replaced ( below 12 volts)
However, I am gonna ask MB dealer if I need to rest the computer for battery change after changing both batteries?!
Your red battery icon is from your aux battery then.

Took the car to my Transmission guy, he hooked up his $ 5000 SnapOn scanner and reset the computer ...test drove the car, it was nice and smooth but on further stop and drive car gave me couple of kicks and ENG light appeared and back to limp mode. My transmission guy told me your conductor plate is shut ! Resetting won't help any more even as a temporarily fix...
The plan is:
Take the car to MB dealer for diagnose and confirmation ONLY and decide from there...
I will follow your instruction.


