The vehicle enters limp mode.
P0643 is a generic code. Sensor reference voltage high. This would indicate a possible wiring issue somewhere. This could be on the electronic throttle module somewhere as it is triggered by using the throttle. Unfortunately it doesn't sound like a simple cheap fix. Look for a mercedes independant commercial garage in your area to have a look at it.
SOURCE: BAS/ASR warning light
You should get the code red by a dealer, if not and you have just changed the pads, then some time the code needs clearing, this merc can do for you or a good garage that has a DC. If not i may know man that can, let me know your area.
SOURCE: Car codes that appear on dash
It would appear that there is a problem with the ASR and BAS systems need to get the vehicle scanned
SOURCE: On a 1995 S500 Mercedes , ASR light keeps coming on
yes they can but unlikely-more likely a bad over voltage relay(powers up idle speed computer) or wire harness-your vehicle is probably a hfm type fuel injection they changed from lh that year. find out if it is lh check the fuses in the base module located in the passenger side of the engine compartment under a cover held in by 4mm allen head bolts-alot of times these control units have intermittent contact with there connectors. asr stands for acceleration slip regulation-both isc and asr communicate via can system to monitor throttle position- ea isc cc-idle speed cruise control and electronic actuater(throttle)-hopefully i have helped
SOURCE: the asr light is on and the car does not
the o2 senser would not cause the a.s.r. light to come on-there is only 2 things that the engine module and the a.s.r. module have in common. 1 is the e.a. actuater(throttle) and 2 is the base module. most likley either your acuater has to be resynchronized or the actuater itself is bad. have codes pulled from your h.f.m.,a.s.r.,e.a-i.s.c.-c.c modules and see what the codes say. You will probably find that they say e.a. actuater module is defective. the pig tail connecters go bad and they need to be replaced just be glad you do not have a 600 series because they cost about 1200 a piece and the v12 have 2 of them. If it is defective and you cannot resynchronize it there is a company that rebuilds them for about 1/3 the cost of a new one- good luck
SOURCE: ASR warning light came on and car stop
Something wrong with your throttle actuator , car needs to be diagnosed at mechanic shop.
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