Hi...My OBD II scanner is unable to read codes from the OBD port on my 98 -420 -w140. There is NO CEL. The car drives fine and i have used this scanner to pull codes from this car in the past with no issues. The car is due for inspection and i routinely scan the OBD port before i take to the inspection place.

I connected the scanner to my 03 ML500 and it works fine. Looks like the scanner is not the culprit here.

I checked the fuses inside the main fuse box and all the fuses are fine. Is there a fuse for the OBD port somewhere else in the car ??? Please help.

Thanks