Subject: Urgent Safety Concern - 2000 BMW 328 Ci - Error Codes P1622, P0304, P0301 - Second Airbag Recall 21V-401 - Request for Engineering Investigation BMW of North America, LLC 300 Chestnut Ridge Road Woodcliff Lake, NJ 07677 May 9, 2026 RE: 2000 BMW 328 Ci (VIN: [insert VIN]) - Multiple DME Fault Codes - Second Airbag Recall (21V-401) - Suspected Electronic Interference To the Office of Customer Relations and Vehicle Safety: I am writing to formally document a serious safety concern regarding my 2000 BMW 328...
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Ci, which is currently subject to the second airbag recall in this vehicle's history (Takata NADI recall 21V-401). The vehicle is exhibiting diagnostic fault codes in the DME (Digital Motor Electronics) that indicate possible electronic interference with the engine control and safety systems. Diagnostic Evidence - May 7, 2026 On May 7, 2026, a professional BMW diagnostic scan (iSCAN S/N 70EB2) revealed the following active fault codes in the DME: 1. P1622 (MAP cooling activation fault) - Present. This code indicates a communication fault between the DME and the EWS (immobilizer) system. In my research, this code is consistent with RF interference on the DME/EWS communication line. 2. P0304 (misfire cylinder 4) - Present and continuous. The misfire on cylinder 4 is persistent and does not respond to component replacement. 3. P0301 (misfire cylinder 1) - Present and intermittent. The misfire on cylinder 1 is also persistent but less frequent. Component Swapping Test - Critical Finding The technician performed a component swapping test: * Spark plugs and ignition coils from cylinder 1 were moved to cylinder 3 * Spark plugs and ignition coils from cylinder 4 were moved to cylinder 6 * Result: The misfires remained on cylinders 1 and 4. They did not move to cylinders 3 or 6. This test conclusively rules out the spark plugs and ignition coils as the cause of the misfires. The cause is upstream - in the DME module itself, or in the wiring/signal path