2015 BMW 535D Engine Problems

My 2015 BMW 535d, VIN number: [XXX] is failing post catalytic 02 sensors. I replaced both of the post-catalytic 02 sensors after 1,040 miles and failed again last week on August 3, 2022. I believe the root cause may be related to the NHTSA Recall Number 21V907. BMW North America has not provided a remedy since notification in November 2021. Recall Status Recall Incomplete, remedy not yet available Summary EXHAUST GAS RECIRCULATION (EGR) COOLER: The issue involves the Exhaust Gas Recirculation (EGR) system which contains an integrated cooling component ("Cooler"). Over time, a leak of cooling fluid (glycol), could develop in the EGR Cooler. Safety Risk If cooling fluid leaks in the EGR Cooler, and combines with typical diesel engine soot deposits while the temperature is high (which is normal), this could create smoldering particles. In very rare cases, these particles could contact the engine intake manifold and cause damage...

TL* THE CONTACT OWNS A 2015 BMW 535D. THE CONTACT RECEIVED NOTIFICATION OF NHTSA CAMPAIGN NUMBER: 18V755000 (ENGINE AND ENGINE COOLING); HOWEVER, THE PARTS TO DO THE REPAIR WERE UNAVAILABLE. THE CONTACT STATED THAT THE MANUFACTURER EXCEEDED A REASONABLE AMOUNT OF TIME FOR THE RECALL REPAIR. THE DEALER AND MANUFACTURER WERE NOT NOTIFIED. THE CONTACT HAD NOT EXPERIENCED A FAILURE. VIN TOOL CONFIRMS PARTS NOT AVAILABLE.