来自排气装置的异物会导致 EGR 故障
故障信息 P1444 和 P16786 是什么意思？是否是空气量流传感器造成的原因？车辆为什么会出现颠簸，以及如何会造成功率损耗？可以在此了解导致这些故障的原因，以及清除故障的解决方案。
Error messages such as P1444 and P16786 are often an indication of problems in the exhaust gas recirculation system (EGR) of a vehicle. These errors lead to symptoms such as engines running out-of-true, loss of power and jerking. Even if the air mass sensor is often suspected as the cause, in many cases foreign bodies from the exhaust tract are the real culprits that disrupt the operation of the exhaust-gas recirculation valve. The causes of these defects are varied, but fragments from the catalytic converter or welding beads in particular can cause problems.
- 电机运行不平稳
- 功率损耗
- 急冲
- 故障代码 P1444，P16786
Damage and its consequences
通过排气装置中的脉动或汽油发动机进气系统中的低压可以 将来自催化器区域的异物抽吸经过废气再循环系统的管道。如果某个异物将 EGR 阀卡在开启状态下，则会持久回吸废气。由此可能导致所述的投诉和故障信息，例如
- P1444 EGR 阀位置传感器 – 区域/功能故障
- P16786 EGR – 流量过大
如果输送的新鲜空气测量值小于针对该运行状态的计算值，则通常还会将故障归因于空气量流传感器。
Causes of faults and diagnostics
该异物可能是 损坏催化器的碎片或制造催化器时的焊珠。请检查催化器是否损坏，例如借助一个内窥镜通过催化器之 前调节探测器的开口，并更换 EGR 阀。
Prevention and cleaning
To prevent these problems, it is advisable to clean the EGR system and the catalytic converter regularly. Diesel vehicles particularly benefit from regular maintenance of the exhaust gas recirculation system, as the exhaust gas recirculation can be particularly soiled here. Timely maintenance in a repair shop and replacing damaged components such as the exhaust-gas recirculation valve can help avoid the need for early repairs and the high costs associated with them.
Summary
A defect in the exhaust gas recirculation system due to foreign bodies can have far-reaching consequences for the engine: from increased fuel consumption to serious damage on important components such as the turbocharger and the catalytic converter. Thorough diagnostics in the repair shop is essential for reading out the fault code memory and rectify the fault. Regular maintenance, including the inspection and cleaning of gaskets and deposits, helps to minimise nitrogen-oxide emissions and maintain engine performance.
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