ABS sensor light on

[Steveshotgun]

I pulled the rear axle half shaft as wanted to check bearing. For some unknown reason I took the abs wheel off and then refitted it. Since then ABS lamp on. I took the sensor out and there is a lot of grease on the wheel. If I take the sensor out an refit then go for a run the lamp is initially off then light up. I think I have either put the wheel in to far as not fully aligned with sensor hole, or the grease is not allowing a good read. Any thoughts anyone

[Trevor]

I would start with the grease, clean it from the reluctor ring and go from there