What should I do if the emission system of Dongfeng Citroen Sega fails?

The common faults of Sega cars, mine too, are mostly caused by incomplete engine combustion caused by cold weather. Solution: Do not ignite immediately after inserting the key, and wait for 5 seconds. After the above situation occurs after ignition, lightly step on the accelerator at about 1500 rpm, and then drive slowly 1 min. Just walking. The car is not shivering very much. It's okay. After driving for a period of time, the engine will have a yellow light prompt. Let's not talk about using engine oil well and washing the accelerator frequently. In the end, we only expect the manufacturer to replace the oxygen sensor or adjust the engine computer parameters. Other methods are only temporary solutions, not permanent solutions.

As for the root cause of the fault, the signal difference between the upstream and downstream oxygen sensors is too large, which exceeds the set range and enters the engine protection mode. It may be a permanent fault (which needs to be deleted by the diagnostic instrument) or an accidental fault (better oil or additives will cure itself).

Check the number of times the engine has detected a fault. If it exceeds 3 times, the computer will recognize it as a permanent fault (persistent fault).

I can propose two solutions:

1. Wash the accelerator frequently, once every 2000~5000 kilometers, and see for yourself how others operate it. Practice makes perfect. The cost of the diagnostic instrument is about 600+/ set. Install a set of software in the notebook and then wash it yourself. It will be initialized on the computer after washing.

2. While cleaning the throttle, remove the upstream and downstream oxygen sensors and soak them in carburetor cleaner or something called carbon remover from Changan Ford, which should solve some problems.

The main reason is that two barrels of oil are not good, and the computer is too sensitive to cause oxygen sensor poisoning.

The above two methods are best done by yourself. If you often go to SSSS, the cost will be a bit high and annoying.