Hi all, had the same ABS Light problem for about 3 years, intermittantly on When starting
The same result as others on the OBD- test, showing P31,32,33,34 ! all sensors,, Impossible!!
to cut a long story short, it turned out to be a Voltage sensitive ABS computer, when the Vehicle is
not used for a week or more-(on holiday) the voltage drops (because of the constant alarm drain)
so when you start it flashes,, a 5-20 mile run until the Static battery charge recovers to ~13 v
a switch off, with foot on the brake, & Restart resets, then everything is ok .....
a daily run is fine, a new/Another ABS computer "May Fix it" as this is a minor inconvenience
it was not worth spending lots of £££ on a "Maybe"
It is interesting that with the earlier Car battery it very rarely showed up, probably because the
older battery's impedence was higher so the voltage recovered quicker ...????
this "quirk" shows up more frequently with the newer battery because it is "Stiffer" and does not
allow the voltage to rise so quickly,,
Fixed Voltage regulators used in these ABS computers have a manufacturing tolerence
so can vary by 5% up or down maybe the one in Mine is on the upper side ?????
Always run the engine to charge battery before Doing an MOT
N.B. print this out and leave on seat as most Testers Do not know of this ......
