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GUIDE / OBD-II

就绪状态不等于没有故障

就绪监测表示复位后所支持的诊断测试是否完成。清码或断开蓄电池可能将其重置。未完成不证明零件损坏，全部完成也不保证整车无故障。启动条件和驾驶循环因车而异。请遵循厂商程序和当地检测规则，不要仅按固定里程判断。

更换零件之前

记录报码及冻结帧，检查蓄电池状态、相关报码和可见的线束或软管损伤。按照该车诊断流程和测试结果决定维修，避免仅凭故障码换件。

扫描记录表 →

有原厂依据的故障码释义

P0300随机或多缸失火P0420催化系统效率低于阈值 · 气缸列 1P0171混合气过稀 · 气缸列 1P0299涡轮／机械增压器 A 增压不足

来源与解读范围

先理解含义，再核对所引原厂页码。通用参考说明和限定车型案例的适用范围不同，采用维修指令前须确认具体应用。

  1. On-Board Diagnostic Test Reference — Section C, Readiness monitor standards ↗

    California Bureau of Automotive Repair

    California reference explains readiness self-tests, vehicle-specific enable conditions and the effect of battery disconnection or repairs. Supports using manufacturer drive-cycle instructions; its inspection tables and exceptions apply only within the California program.

  2. Performing Onboard Diagnostic System Checks as Part of a Vehicle Inspection and Maintenance Program — EPA420-R-01-015, June 2001 ↗

    U.S. Environmental Protection Agency

    Historical US report, Readiness Status sections, printed pages 10–15: evaluated/not-evaluated status, manufacturer-dependent enabling conditions, reset effects and why incomplete status alone does not establish an emissions defect. Its old monitor inventory, test allowances and suggested driving duration are not current worldwide guidance.