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Having some weird issues on a S550 I just picked up.
i replaced the batteries as some errors I noticed were due to the battery. Also a simple battery test confirmed a replacement. But this error is confusing. It’s a left and right speed sensor error and then a ‘Chassis CAN bus’ error. Attached a photo for more details. Wondering if it’s really the speed sensors or the ABC module.
anyone see this error or have any ideas what it may be?
if they mean ABS sensors then these can cause the most amazing amount of noise across every module on the car - just one failed sensor can even cause the car to lose ALL gears forwards or back
go in live data of the wheel speed sensors and go for a very short drive if they are playing up its normal its a dead wheel speed sensor (usually at the back) - are the fronts even connected ?
worse fun is the ABS modules on ALL cars die frequently (but merc ones are better than most) - whilst that seems strange its because mostly come from one of two suppliers - but they can order how quickly you like them to die - Ford buy the best and BMW the very worst, failing at 5 times the rate of Ford ones for the 'very same' component - its all about how tight the ESP pump brush guides are specified
a dead ABS module usually gives no comms to the unit
a failing pump might wake with a smack from a hammer and often mentions pressure faults (as its not running correctly)
a dead ABS wheel sensor gives no reading on the offending wheel
Thank you! Will check on this in the am and see what I find. I know the car was converted to coilovers instead of airmatic so I can assume someone was playing with connectors they shouldn't have.
.... I think he meant ABC delete to coil springs and dampers (maybe as doesn't know two suspension types possible on the w221)
which would make an ABC error a distinct possibility - and would need coding out or a dongle to lie back to the car the ABC was doing what it should (some spring and damper kits make an removal dongle for the airtragic setup...)
go to chassis decode tool to see what it was built with
487 ABC SUSPENSION (ACTIVE BODY CONTROL)
or
489 AIRMATIC DUAL CONTROL / AIR SUSPENSION SEMI
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