The secondary air pump is broken and symptoms appear.

When the secondary air pump is damaged, the engine warning light in the instrument will light up, and the fault code recorded in the engine regulating unit is p04 1 1. The secondary air pump is one of the outdoor purification devices to reduce exhaust emissions. Its function is to blow secondary air into the waste gas to increase the oxygen content in the waste gas. Due to the increase of oxygen content, unburned carbon monoxide and hydrocarbons in waste gas will be re-burned at high temperature, thus reducing the emission of harmful substances in waste gas and playing an environmental protection role. According to the working principle, the function of secondary air pump is more obvious when the car is cold. If you want it to work all the time, it has self-diagnosis after cold start, and it only works for a part of time after warm start. Of course, when the secondary air pump in the car is not working, it must be broken. If the engine alarm indicator light is on, it may not be the secondary air pump, but the secondary air pipe, vacuum pipe, secondary fuel injection valve and positive wire are wrongly connected, and the exhaust passage of the cylinder head is blocked. It is also necessary to determine whether the secondary air pump is damaged due to the wrong code. But if the secondary air pump is broken, it will definitely affect the engine alarm indicator.