Originally Posted by dmorgan

My 1994 E320 wagon started to have abs and asr
warning lights on after I drove above 5 miles per
hour. When turn off the ignition and start again, the
abs and asr were off until driving again. I suspected
wheel speed sensors might be damaged or dirty but
don't know which one. So I used the 16 pin connector
next to the battery with the push button to read the
codes to pinpoint the problem and showed no
blinks/flashes, just the LED on (Igntion turn on, no
start). I also tried the code reader and had the same
results, LED on and no blinks/flashes. In addition, I
took out the brake light switch located behind the
brake pedal to test it using the multimeter and works
fine. All my brake lights in the rear of the wagon
works good.
In addition, I checked the OVP (Over Protection Relay
behind the battery under the cover) for damage fuse,
none of the fuse was broken, but I replace the fuse
just to be safe. The OVP was replaced last year when
I replaced the alternator as well. The battery and
alternator are fine.
I am tempted to go to the Mercedes dealership 80
miles from home to have the diagnostic scanner test
and the cost is around $160 for the test, taking a half
day worth of work, so the Mercedes dealership
claimed. I am not too crazy about doing that. I am
also tempted to look into buying an OBD I diagnostic
scanner tool, if there is one for my 1994 E320 w124 and I am not sure that would help either, since I
already have a code reader. Any ideas or
suggestions? Your response is greatly appreciated.