Question
Why do some vehicles require OBD relearn instead of auto relearn?
Answer
Their ECU architecture stores sensor IDs in secure, RF-unwritable memory blocks.
Explain
Certain OEMs (e.g., GM, BMW) lock TPMS ID memory to prevent accidental overwrites. OBD relearn injects new IDs directly into the ECU via diagnostic protocols (UDS/ISO 14229). CHEPQ OBD tools support forced-sync mode to bypass ECU security checks for quick ID registration.
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