[JFP in PA]

Not necessarily. They have been reported being found quite by accident on cars with no codes or other apparent issues. On the couple we have seen, that was also the case; no codes or symptoms. This “lack of warning” has always been the issue with IMS failures.

To Jake’s credit, by the time you see cam deviation values “dancing”, the engine is already circulating oil full of metal particles; his approach would have sensed this sooner, before the circulating metal caused collateral damage.