What the hell is red-brown oxygen sensor?

The car was bought at 20 1 1. Last year, the engine fault light of the car was always on, and the computer test showed the fault code: P2 177 system was too sparse when idling, and the computer was cleaned several times. Later, the injector and throttle valve were cleaned and the oil pump was changed, all of which were useless! ! ! Basically, after driving for about 30 kilometers, the fault light will come on again! (A few times it was lit when the engine was running at 3000 rpm), and then it cleared lazily and he lit it. Yesterday, I went to the inspection station for annual review, and the exhaust gas was not up to standard! After looking for a scalper outside for a long time, he changed an oxygen sensor for me, and mine was reddish brown when it was removed! After changing it, it passed the test! Excuse me, do you want to clean the oxygen sensor or change it to a new one! If so, how? I saw the forum soaked in alcohol before! New basic guarantee 180 days! 200-500 yuan, no! Excuse me! Correction: the exhaust gas is not up to standard, but the function of three-way catalyst is almost invalid. Therefore, replacing the oxygen sensor is not a long-term solution. If the oxygen sensor fault light does not light up, it does not need to be replaced, but it can be cleaned. Changing it is a waste of money. The permanent solution is to clean the three-way catalytic converter. I suggest you change the gas station. The heavy color of post-oxygen is due to the high content of methyl cyclopentadiene manganese tricarbonyl (MMT) antiknock agent in gasoline. Only when the grade of refined oil is seriously insufficient will such a high proportion of antiknock agent be added. High MMT content in gasoline will lead to manganese tetroxide deposition, and oxygen will destroy the three elements before it is destroyed. At present, all cleaning products are only aimed at carbon deposition and are ineffective for manganese deposition. Under normal circumstances, there must be something wrong with the fuel you use. If the gasoline that meets the national MMT content standard of fuel oil is used, the pre-oxidation must not be this color, and this color is caused by the high MMT content of iron; Unusually, you may have used some kind of inferior fuel additive, which added MMT. What is the specific reason? You can judge for yourself. There are many photos of oxygen before cleaning in the forum. You can find out what color the oxygen is before cleaning. For a new ternary, such a high manganese content is difficult to resist 65438+ 10,000 kilometers. A little advice, for reference only. Three-way catalytic or oxygen sensor. This problem needs to be solved. Wait until the next annual review. Mainly solved the engine fault problem! The fault light is on all the time, which is very uncomfortable! Finally, it's all right now! Thank you for your guidance! P2 177, I've met it too. It's no use changing pre-oxygen. Just change the air flow meter. Just try it. Anyway, the air flowmeter is cheap 100 yuan. I suggest you change the oxygen in front to NTK. Please reply in unison! The oxygen sensor is reddish brown, which is a normal phenomenon. As for the tail gas that is not up to standard, we will check it again next year. Fault code P2 177, the system is too sparse when idling off B 1! I went to the 4S shop for testing, and 70%-80% was due to the fault of the MAF sensor! Because my sensor must be broken! Now a disassembled part has been replaced, more than 60 kilometers, and the fault light is still not on! Don't light up later! The problem that the tail gas is not up to standard is not the problem of the oxygen sensor, but the function of the three-way catalytic converter has almost failed. Therefore, changing the oxygen sensor is the fundamental solution, and there is no need to change the oxygen sensor. Just clean it up It is also a waste of money to change it. The radical solution is to clean the three-way catalytic converter. Waiting for change! Let's talk about the oxygen sensor first, and then look at the air flow meter. Because I read a lot of stickers, some clean the throttle and some clean the nozzle. The condition of the car is different, and the damage is different. @20 19