Why does the fault light come on after refueling at Sinopec?
3 Answers
The reason why the fault light comes on after refueling at Sinopec is due to poor fuel quality. Relevant information is as follows: 1. Solution: In the case of poor fuel quality, generally after refueling and turning off the engine, the engine fault light will automatically turn off about 30 seconds after restarting the vehicle. 2. Quality: The emission system is very sensitive to fuel quality. Try to choose reputable large gas stations for refueling, and avoid using substandard fuel unless absolutely necessary. If you have added inferior fuel, you should immediately go to a maintenance station to clean the fuel tank and fuel lines. If the vehicle has been used for 3 to 4 years or more, the oxygen sensor itself may also malfunction. In this case, it is best to go to a 4S store to clear the fault.
I have quite a bit of driving experience and have seen many cases where the warning light comes on after refueling. Sinopec's fuel should theoretically be fine, but it's possible that the gas station just finished unloading oil, stirring up impurities from the bottom that got mixed into the fuel. Additionally, there might be differences between different batches of fuel, especially when mixing new national standard fuel with old standard fuel. The onboard computer may detect abnormal combustion and trigger the warning light. Another common reason is the fuel cap not being tightened properly after refueling, causing vapor leakage. If the engine already had severe carbon buildup, the new fuel might trigger the knock sensor alarm. It's recommended to tighten the fuel cap and drive a few dozen kilometers to see if the light goes off. If not, take it to a repair shop to read the fault codes and check the fuel tank pressure or fuel quality.
Yesterday, right after refueling with Sinopec 95-octane gasoline, my car's yellow warning light came on—what a headache. The mechanic said it might be water entering the fuel system, possibly due to poor sealing of the gas station's storage tanks or water in the tanks mixing with the gasoline. Another possibility is a clogged fuel pump filter screen, where refueling stirs up sediment at the bottom of the tank, causing unstable fuel pressure. Additionally, some car models are particularly sensitive to fuel quality changes, triggering an alert when the computer detects abnormal air-fuel ratios. The solution is actually simple: note any abnormalities before and after refueling, such as engine shaking or sluggish acceleration; use a fuel system cleaner or switch gas stations, then observe after running through this tank of fuel.
