hey guys. for the last couple weeks my ABS and ASR light have been on. searching for solutions i found a lot of different problem areas and resoltuions along with a lot of people in general having this issue. I was able to fix the problem by simply sanding clean the contact points on the speed sensors/discs and just wanted to share my info for future searchers.
my light came on during the last snow fall in seattle. i didnt crash or anything but the ASR was kicking in a lot. seeing how it was working at first but the light stayed on afterwards i figured it wasnt the abs module. i went to my local shop and checked on here for things to check. this is a basic list.. speed sensors on wheel and thier contact points (check for solid wiring), fuses on top of battery, abs module itself possibly needing just a cleaning.
if you've done work on suspension you might have pulled the sensor loose
or if you are using extended lug bolts that could possibly be contributing.
in my case i just took off my front wheels and checked the sensors to make sure they were clean and tight. they looked good but in between the sensor and the disc there was a decent amount of gunk/build up. possibly a layer of rust making for a bad connection? i folded a sheet of sand paper and lightly cleaned the sensor surface and thats all it took. problem solved and lights are off.
before i did any of this i called my local dealer with my vin# in hand and requested any "outstanding recalls" on this car. they are obligated to tell you. my car did not meet the year/model that they had the abs recall on and im not sure which ones do but it doesnt hurt to check.