AO Gold Member
Join Date: May 2008
Location: United Kingdom
County: Perth and Kinross
Re: fault code help please
From my (limited) experience, a damaged sensor ring would wreck the sensor very quickly....certainly within 10K.
I don't think the variator failing can bring on the ECU light. The actuator solenoid can, but that would be a 'phase angle adjustment' fault code, or something like that...
Opinion seems to vary on the cam sensor.... I had a GTV with a buggered one, and it ran and started 100% fine. Others say it can cause the engine to cut out or fail to start. This may be down to the engine revision - the sensor ring on the GTV had one 'notch'. The one on the 156 I'm breaking has two, for reasons best known to Alfa/Bosch!
A new sensor is about £60 from a factor, £120 from Alfa. You'd be strongly advised to change the cambelt at the same time (~£25). You could probably leave the tensioners/idler/balance belt stuff until the next due belt change. It's a risk vs cost that you need to consider carefully....
The sensor is behind the exhaust cam pulley and getting at it means doing 90% of the work required to change the timing belts (if not more).