Sirion wheel speed sensor tone wheel gap

Forum: 

I recently purchased my 2008 Sirion 1.5 Sport. However the ABS lights stay on on the dash and also the EPS light. I have checked all fuses, relays etc. Even had the steering off to check the torque sensors. All is in order. Now I want to make sure the wheel speed sensor gap is correct as a last resort. But it doesn't look as if you can adjust it. My question to the forum is can it be adjusted? How do. You adjust it and what should the gap be?

Thanks