On Alfa number 15
AO Platinum Member
Join Date: Dec 2005
Location: United Kingdom
Re: 156 starting issue
Its an easy fix. The sensor is located underneath the starter motor, so st the right rear of the engine if looking at the front of the car.
The connector for the sensor is brown and clipped on the inlet manifold, you may find it easier to follow the wire down to the sensor.
The sensor is held in place with a M6 socket cap bolt so you will need a 5mm Allen key to undo it.