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Did I get this right? You pay $400 for a warning system which when it goes off (and who knows when or why) it convinces you to pay $2,000 to repair a failure that hasn't yet happened?
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Perhaps you fail to realize that when a failure occurs the collateral damage exceeds what can be repaired without a complete engine disassembly or replacement?
With the number of people who are absolutely unwilling to electively replace their IMS Bearing until it shows signs of failure this system allows them to procrastinate as long as possible while they are afforded a sense of security, both visually and audibly.
This is an IMS Bearing that is not caught soon enough in the failure process.
The failure process is made up of four stages of bearing degradtion and ultimately failure. Collateral damage created by the lack of IMS support and alignment is more damaging to the engine than thew actual IMS bearing failure.
This bearing is at Stage 3 failure. It was caught in time and was extracted from the engine and replaced with an IMSR procedure. This person was lucky because the engine had a noise and a release of oil that was noted before the bearing completely fused together, seized and then snapped. Note the wear materials inside this bearing, it did not lose any balls or other major pieces at the time it was extracted, but it only had miles of use left in it before it failed completely.
The owner of the car is still driving it today.
So the key to being able to save an engine withoput complete replacement is advanced warning. Doing so enables the bearing to be extracted and replaced easily with no collateral damage occurring.
Here are some samples of collateral damage that occurred when the IMS bearing failed, valve timing was compromised and components began to collide with one another, stemming from some form of IMS related incident.
What people do not realize is once you hear a noise, notice a symptom or actually grasp the fact that something is happenning to you, the engine is often times past the point where it can be saved without complete disassembly and complete reconstruction.
Put simply: Once the full failure occurs, you don't have enough of an engine left to repair.