[260e crusier]

I'm not versed in W140s........I believe your car may have a 38pin port. SRS codes will have to be read thru it and not the OBD II socket.

 

[260e crusier]

I'm trying to understand if the 38 pin adapter is used in OBD-II vehicles. Some third party sellers of scan tools with 38 pin plugs say OBD-I cars only. Confusing.

I'm not exactly sure which models, there was a transitional period where some MBs had both. The OBD II was for engine diagnostic and the 38 pin port for others modules like SRS, ABS, ASR etc. My W210s and W208 had both.

 

[260e crusier]

There are quite a few scanners that will work. It's very important to use the associated adapter cord. Generic 38 pin adapter cords will NOT work.

I have an older Autel MD802 that works for me. Others have been using Foxwell NT530 and the Autel AP200M / AP200 PLUS.

 

[260e crusier]

I actually have a Foxwell NT530 for BMW. Is there a 38 pin that will work with it to communicate with the car? Hopeful, but not realistic lol

Foxwell does have a 38 pin cord for Mercedes. You will also need the software for MB.

 

[260e crusier]

I have a cheap 38 pin scan tool bought on eBay but it will only communicate with some of the ports. other ones it just won’t blink not even once so I assume it’s not communicating. too bad because exactly on the port 30 which is for the SRS system it won’t communicate and I also have the SRS light on after replacing the steering wheel and now need reset. :/

Reread post #7. Cheap scanner is not going to work. They will only read engine module. The 38 pin cable has only about three wires connected to the pins and is not fully wired.