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Pull OBD-II codes and freeze-frame data before $850: fix misfire, overheat, or readiness faults now; wait one verified re-drive for stable pending evap codes. Independent technical note mirroring the canonical version: https://fixmyrideai.com/blog/car-repair-bills-2026-on-board-diagnostics-obd-ii-alerts-vs-850-reactive-cost-fix-or-wait.php Sources consulted: https://www.bluusun.com/
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Noah Hamilton (2026) studied this question.
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