问：CEL灯P0501 P0500 P1529 U1400在2001年现代Elantra

代码P0500，P0501和P1529与车辆速度传感器输入有关。发动机控制单元依赖于车轮和变速箱的传感器输入以及其他数十个传感器来确定车辆的行驶速度。如果是检查引擎灯已经打开使用这些代码，ECU将把车辆置于将运行的“ li行模式”，但不能正确运行。可能的原因可能是车轮速度传感器如果配备（最常见于右前轮）或车速传感器通常位于变速箱中或在变速箱中。代码P1400与排气再循环有关（EGR）。通过EGR阀a small amount of burned air and fuel is rerouted from the exhaust and back into the combustion chambers at certain speeds to cool the combustion chambers and reduce the chances for ’knock and ping". Although unrelated to vehicle speed, this code may simply be present due to the way the engine is running due to the speed codes. Have a certified technician inspect the vehicle. If replacement of a wheel or vehicle speed sensor is determined to be the cause and replaced, the egr code may go away. If it returns, then the egr system will have to be inspected to find the exact cause for that code.