RE: 1995 E320, this is really wearing thin on me... My ABS & ASR lights have illuminated probably four-times this week. Each time I retrieve the code, I get the one flash. I then clear the codes anyway for the hell of it, and the lights are off until this recurs. The car drives beautifully the whole time the ABS/ASR lights are on - no acceleration issues at all. The OVP was replaced last year with a quality MB-brand relay. When both of these lights illuminate, I have no ABS (I tested that feature in the sand just out of curiosity) until I clear the code. What gives?

others may be able to weigh in....but it could be the mas relay going south.

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1989 300ce 129k
( facelifted front,updated tail lights, lowered suspension,bilstein sports, lorinser front spoiler, MOMO steering wheel, remus exhaust,stainless steel brake lines). (Gone)

1997 s320 154k (what a ride). Sold with 179k miles. Replaced with Hyundai Equus

1994 e320 Cabriolet 108k



1972 280se 4.5 153k Owned for 12 yrs, sorry I sold it


[/SIGPIC]

What does that stand for? I'm drawing a blank on MAS.

it's a multi function relay that replaced the fuel pump relay and the klima relay in those models..

__________________
1989 300ce 129k
( facelifted front,updated tail lights, lowered suspension,bilstein sports, lorinser front spoiler, MOMO steering wheel, remus exhaust,stainless steel brake lines). (Gone)

1997 s320 154k (what a ride). Sold with 179k miles. Replaced with Hyundai Equus

1994 e320 Cabriolet 108k



1972 280se 4.5 153k Owned for 12 yrs, sorry I sold it


[/SIGPIC]

It's in the area of the OVP by the battery or is it behind the fuse box with that group of relays?

by the ovp

__________________
1989 300ce 129k
( facelifted front,updated tail lights, lowered suspension,bilstein sports, lorinser front spoiler, MOMO steering wheel, remus exhaust,stainless steel brake lines). (Gone)

1997 s320 154k (what a ride). Sold with 179k miles. Replaced with Hyundai Equus

1994 e320 Cabriolet 108k



1972 280se 4.5 153k Owned for 12 yrs, sorry I sold it


[/SIGPIC]

MAS= Mass Airflow Sensor

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Dr. Brad

2003 C320 4Matic Station Wagon
2002 C240 Elegance
1982 380 SEL Star Certified

MAF = Mass Air Flow sensor.

MAS (no idea why it's called that) is a cigarette packet sized box that plugs into the system via a multi-way connector. It is locked in place by a knob on top.

This MAS box does replace the fuel pump relay of earlier systems and is found in later KE-Jetronic systems.

It may also feature in the HFM systems of the original poster's vehicle but I don't know.

RayH

MAS is commonly used here for Mass Airflow Sensor (as is MAF). MAS needs to be followed by the word "relay" to be clear, and it was.