First time posting, done some hunting and can’t find a definitive answer. I recently invested in a 1997 E300TD. When I test drove it it was jammed in second gear which I have since found out is limp mode. So I went and invested in a snap on adapter to fit the diagnostic port in the 210’s. No communication what so ever. No control units will talk to my machine at all. Now when I first seen the car it wasn’t starting and after some digging I found the ECU box had been leaking and was filling with water. Blew all the water out with compressed air and sprayed up with WD-40. Attempted start again and started first turn after lying up for 2 years. My question is, is there any way to read faults from the 722.6 in my car without the diagnostic port? Or a way to fix it? Checked all fuses including those in ECU box all ok. Has anyone else had an issue like this? The adapter talks 100% with my E300D parts car so no issues there. Thanks in advance.