Why does the engine fault light come on when driving the Fengjun 3 petrol version?

The error light on my new Sail also came on twice. My solution is for reference. When my fault light first came on, I went to the 4S store to pick up the computer and checked it. This was said to be due to a fault in the front oxygen sensor. The cause of the fault also indicated ". current". The 4S store master said the “current” display shows oxygen. The sensor may or may not be defective. It is recommended to clear the error code and then drive for a while to try again. If the error code appears again, it must be broken and the parts must be replaced. If it no longer lights up, there is no need to replace it. Erasing the fault code is free, whether the car is insured or not. After clearing the fault code I drove for another year and the fault light came back on after checking the code it was still an oxygen sensor problemene. The cause of the problem is that the screen displays "History", which confirms that the oxygen sensor is indeed faulty. The 4S store said replacing the oxygen sensor would cost over 300 euros plus labor time and over 400 euros. too expensive, so they asked him to clear the code and get out. The auto repair shop replaced it and replaced a front oxygen sensor for 250 yuan. Replacing the front oxygen sensor is relatively simple. I checked online that the accessories cost more than 100 yuan. yuan each. You can also choose to replace it yourself. I have seen several owners of new Sail cars whose error lights come on because of the front oxygen sensor. This item generally needs to be replaced after two or three years of use. You can go to the 4S store to check the code to see if the fault light is on because of the sensorr oxygen before. If the car is not out of warranty, ask the 4S store to replace the parts for free. warranty, it is recommended to go to an outside auto repair shop or purchase it yourself. Parts are cheaper to replace.