ABS light issues

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Discussion

Tom _M

Original Poster:

417 posts

70 months

Friday 20th July 2018
quotequote all
Have got a '99 Honda CR-V which has a bit of an intermittent ABS light. Apparently it's not an uncommon fault on these as the sensors can get mucky/knackered. Can sometimes feel it kicking in at low speeds & dry roads, so presume sensor thinks one of wheels spinning a bit more than the others when it actually isn't.

Problem is it's not on all the time, so will come and go, which is meaning it could be tricky to get the code read from it when the light is actually on. Have got the MOT coming up in September and thinking ahead to that as know an ABS light is going to be a fail. I might be lucky in that it stays off for the duration, but equally I might not...

Any idea what category of failure the ABS light would under new rules? Does the test require the light to be illuminated on startup and then go out? This is pre-mandatory ABS so just wondering if could disable it temporarily somehow (remove fuse/relay?) then that would get rid of the light?

E-bmw

9,217 posts

152 months

Friday 20th July 2018
quotequote all
My understanding is that they will do a start-up sequence for the car & if the light doesn't respond correctly (as in, on then off) that is a fail.

That concerns ANY car with it fitted as standard AFAIK.

I am sure someone who is actually a tester will be along soon to confirm/deny that.

Little Pete

1,533 posts

94 months

Friday 20th July 2018
quotequote all
E-bmw said:
My understanding is that they will do a start-up sequence for the car & if the light doesn't respond correctly (as in, on then off) that is a fail.

That concerns ANY car with it fitted as standard AFAIK.

I am sure someone who is actually a tester will be along soon to confirm/deny that.
Spot on E-bmw.
OP, the fault you are describing could be caused by a cracked stator ring. This is the castle type ring that gives the sensor a pulse and a crack makes the gap between the raised sections slightly bigger. At low speed the slight delay in reading a pulse makes the ecu think a wheel is locked and it activates the abs. A cracked or damaged stator ring is still a fail but whether or not a tester spots it is another matter!