Help anyone. My subaru  ticks over fine with abs illuminated  due to it needing a new sensor.

But when I pull away check engine light comes on and off when accelerating  and de acelirating  when I come to a stop the light goes off any ideas ?

Hi. Have you looked for logged fault codes?

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It's likely related to the abs sensor but as linx said, do a code check. There's a thread on here explaining how.