问：两种机械师万博亚洲客户端无法修复失火。

你好呀。检查摄入量是否周围有可能的真空泄漏。4。如果圆柱体编号4周围没有真空泄漏，则可能会有一个燃烧的阀门。Check the compression on all of the cylinders and take close attention to cylinder number 4. If cylinder 4’s compression reading is lower than the other cylinders, then you will need to perform a leak down test (requires compressed air and a leak down tester tool). The test will check for any major leaks and exactly where they will be coming from. A burned valve will cause most of the issues with the smog and check engine light. For the code P1620, I recommend replacing the thermostat and flushing the cooling system. Check the fuse and relay to the secondary air injection pump and make sure that they are functional. If the air pump is working, then the exhaust system is taking in too much oxygen from outside the system causing a leak and making the sensors pick up this mixture setting the engine light. If you need further assistance with getting your vehicle to通过烟雾测试，然后寻找一个专业人士，例如您的机械师，以帮助您。