[mikefocke]

Contain a flow chart with tests you perform as the action items and then depending on the results you follow the arrows and do the next test or the action. These go on for pages and some require special tools.

Code reader resets don't fix the underlying cause.

Most of these are vacuum leaks.

The reason there isn't a consensus is that there are multiple causes and some people are successful in tracing the problem, some take the car to an experienced M96 engine mechanic and few bother to post the results. Don't go throwing more parts at the problem.