I’ve been with audi service for a long time… we went through a very similar situation post covid, their newest engine plant in Mexico had assembly/debris issues causing con-rod bearing failures. Same result, catastrophic failures, metal throughout the lubrication system. This only applied to the Mexican built 4 cylinder turbos, in far less numbers than this toyota issue.
This post is not to say what Toyota will/should do, but compare what Audi did.
The situation started the same, engines knocking, stalling in traffic, punching holes in the block. Once the trend was noticed, a preliminary safety recall was announced with no remedy available. The manufactures are require to acknowledge there is an issue due to safety hazard, while gathering info for the repair. This took around a month(iirc). Then a remedy became available. There were different ways the campaign could be handled: if the vehicle came to the shop with the campaign open. The service tech, would evaluate for knocking, running rough, topical signs of a failing engine. The the oil filter would be removed and inspected for metal. If none found, the filter would be reinstalled and the vehicle would be test driven hard, multiple full throttle accelerations, in an attempt to make it let go. Then the filter would be removed again and inspected. If all is well the vehicle would be returned to the customer with a warranty extension for the engine assembly. If at any time metal was found, documentation of findings were sent for review, then a special complete engine part number would be ordered. This special complete engine entailed no parts swapping at all, including turbo, harness, and ECM. This repair applied to engine failures if the campaign had not been performed(failed on the customer prior to inspection) or engine failure/metal found during campaign.
If the campaign was performed and passed, then engine failure occurred, the repair would be long block/turbo replacement.
We found that there were engine failure outside of the scope of the campaign, due to tracking discrepancies. The engines are not built for specific VINs, so there were stragglers and carry overs that did not land in the VIN scope of the campaign. All none campaign vehicles were repaired with long blocks/turbos.(a possible example of how some ‘24 Toyotas are having issues)
Again, this is just for comparisons sake of how a different manufacturer handled a similar issue. The Audi campaign was 13i5 for anyone wanting to review in detail.
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