CEL WILL NOT ILLUMINATE or COMMUNICATE
 

1996 E320 CEL will not illuminate. When scanner is plugged in, there is no communication between the vehicle and the scanner. I also notice that the cruise control does not work, and the car idles really high...up to 1200 RPM. I have checked all the vacuum and I don't see any problem. I have replaced the crankshaft sensor, and many other related parts. I do not want to continue replacing stuff until I am able to scan for codes. I will appreciate any help.

most scanners need a adapter to use the port in engine area.You might try cleaning your Mass air flow sensor.

Check fuses on passenger side by modules in engine bay. I had somewhat same problem on my 98 E320 scanner would't communicate the fuse was blown but CEL would light up. Hope this helps you out.

Take a pic with your fone of the OBDii port up under the dash and compare pin locations to your scanners plug, guessing they are not the same.......

I was using a Snap On code reader it hook to the under dash port,and gave me make,model and vin.I had to connect under hood to clear codes.

Thanks guys for your advice. I am actually planning on buying a new MAF sensor, and see if it will solve the problem. I have not check the fuse on the pass side yet, but I will. I will be sure to post the results. By the way oldsinner11, where can I get the Snap On code reader from?