420SEL (126.035) V8-4.2L (116.965) (1986)
Wheel Speed Sensor: Technical Service Bulletins
ABS - Modified Rear Axle Speed Sensor
REF.NO. 35/51, 42/101
TO: OUR MERCEDES-BENZ PASSENGER CAR DEALERS
DATE: November 1986
SUBJECT:
MODIFIED REAR AXLE SPEED SENSOR ALL 1986 MODELS
FIGURE 1 - SPEED SENSOR WITH STEEL FLANGE
As of March 1986, a modified rear axle ABS speed sensor was gradually phased into production on models 124 and 201, similar to the sensor installed
on models 107 and 126 since September 1985 production (Figure 1).
FIGURE 2 - DISTANCE BETWEEN SENSOR MOUNTING HOLE IN REAR AXLE HOUSING
The modified speed sensor is recognized by its steel flange, previously a plastic flange. The mounting hole in the steel flange and in the rear axle housing
has been moved due to the larger sensor head (Figure 2).
As a result, there are now two versions of the rear axle housings.