Sensor could be bad, but you'd need a scope to check it - or you could try backprobing the wires with the key on, wheel jacked up & spinning and the DVOM set to A/C. Do all 4 and compare notes.

Alignment would have no impact on sensor input.

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A.S.E Tech A1,A6,A7,A8 & MVAC 609 + EPA 608

Unless stated otherwise, any question I ask is about my greymarket 1985 380SEL.