这个码是什么意思？
控制器在监测条件下判断催化系统效率不足。P0420 对应第 1 气缸列，P0430 对应第 2 气缸列。应排查排气漏气及失火、混合气相关码，并按车型评估传感器信号及催化器测试。报码本身不能证明必须更换催化器或氧传感器。
来源与解读范围 [1]
故障码描述检测到的异常，不直接指定必须更换的零件。
厂商原文中的含义
原文含义可能随车型和后缀变化。此处按来源展示，不代表通用诊断结论。
P0420Catalyst System Efficiency Below ThresholdP0420Catalyst System Efficiency Below Threshold Bank 1P0420Catalyst System Efficiency Below Threshold Bank 1P0420rear bank catalyst system efficiency below threshold [bank 1]厂商技术资料
350以下为英文原文
FORD
原文报码 P0420
Some of the vehicles listed in the Model statement above may exhibit an incorrectly illuminated malfunction indicator lamp (MIL) with diagnostic trouble code (DTC) P0420 stored in the powertrain control module (PCM).…
RAM
原文报码 P0420
Flash: Powertrain Control Module (PCM) Updates Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle exhibit/set SYMPTOM: one or more of the following Diagnostic Trouble Codes (DTCs):…
CHRYSLER, DODGE
原文报码 P0420
Flash: Powertrain Control Module (PCM) Updates Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must exhibit/set one or more of the following Diagnostic Trouble Codes (DTCs): ●…
DODGE
原文报码 P0420
Flash: Powertrain Control Module (PCM) Updates Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must exhibit/set one or more of the following Diagnostic Trouble Codes (DTCs): ●…
JEEP
原文报码 P0420
Flash: Powertrain Control Module (PCM) Updates Customers must experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle must exhibit/set one or more of the following Diagnostic Trouble Codes (DTCs): ●…
DODGE
原文报码 P0420
Flash: Powertrain Control Module (PCM) Updates Customers may experience a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician must find one or more of the following Diagnostic…
核对适用车辆
1,761车型关联可作为查阅线索；具体发动机、生产范围和软件条件请核对厂商资料。
| 品牌 | 车型 | 年款 |
|---|---|---|
| Acura | TL | 1999 |
| Acura | TLX | 2019 |
| Acura | TLX | 2018 |
| Acura | TLX | 2017 |
| Acura | TLX | 2016 |
| Acura | TLX | 2015 |
| Audi | A3 | 2024 |
| Audi | A3 | 2023 |
| Audi | A3 | 2022 |
| Audi | A3 CABRIOLET | 2016 |
| Audi | A3 CABRIOLET | 2015 |
| Audi | A4 | 2023 |
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。
来源与解读范围
以下解释由本站依据所列原厂资料整理。页码从 PDF 文件第一页计数。原文为英文，译文供查阅参考；引用某个版本不代表它就是厂商当前最新指令。
- 2024–2025 MY OBD System Operation Summary for Gasoline Engines ↗
Ford Motor Company · PDF 页码 2, 3 ·
来源核对日期 · 2026-10-27
还能继续驾驶吗？
仅靠故障码无法判断是否适合继续行驶。故障灯闪烁、严重抖动、过热、机油压力报警或制动转向异常都需及时处理。影响车辆控制或发动机安全时，应在安全地点停车并寻求帮助。以车辆手册为准。