Possible that the rear sensors are broken.
Check to see if you accidentally disconnected the wiring to the sensor at the rear wheels
abs sensor
try changing your oxygen sensor I have changed the oxygen sensor and it did not help. Do you have any other ideas? Could it be the carb?
The oxygen sensor on a vehicle will need to be changed about every 100,000 miles for the newer vehicles. An older vehicle might need this part to be changed more often. If this part is working properly, there is no need to change it, no matter how many miles are driven.
many cars have multiple O2 sensors. If you expected the light to go out, just from changing the sensor it won't . Are you sure You changed the right sensor The light may need to be re-set by a garage or using a scan tool. What kind of vehicle are we guessing on?
At least one of the 4 ABS sensor signals is faulty. Normally changing tyres will not trigger ABS sensor fault signal. Either sensor is damaged or sensor cable is broken, shorted or grounded.
the rotors do not have the ridges so the abs sensor can see something.did you purt abs rotors or non-abs rotors on vehicle. most cars light up brake when low on brake fluid, a few cars light up ABS to show same thing. Of course there is the possibility that there really is something wrong with the ABS circuit.
There is no way for us to know that.
They are behind the front rotors and you can't see them. But you can see were the electric wire goes in behind the rotors that hook to them.
Try changing the crank sensor it worked on my 1993. Behind the harmonic balancer.
Replace the sensor
crank sensor or cam sensor