Is the Malfunction Indicator Light (MIL) a Common Issue in China VI Vehicles?
4 Answers
No. The illumination of the vehicle's malfunction indicator light is not related to the emission standard. In fact, the online rumor that China VI engines are prone to triggering the MIL is unfounded. There is currently no evidence suggesting that China VI engines have a higher probability of malfunctions compared to engines meeting other emission standards. Reasons for the Malfunction Indicator Light: When the MIL illuminates, it indicates a fault within the vehicle. This fault is not necessarily caused by the engine; it could also stem from issues with the transmission, coolant temperature sensor, oxygen sensor, or other components. The specific problem can only be diagnosed by reading the fault codes with specialized diagnostic equipment. China VI Engines: Not all China VI engines frequently trigger the MIL. Many models equipped with China VI engines demonstrate excellent reliability. In fact, numerous China VI engines are based on their China V counterparts, with the addition of a particulate filter to reduce exhaust emissions.
I've been driving for twenty years, from China III to China VI, and I don't think the frequent illumination of fault lights in China VI vehicles is a common issue, but it is indeed more noticeable. Back when I drove a China V vehicle, the fault lights rarely came on unless there was a serious problem. Now, with stricter China VI emission standards, vehicles are equipped with more sensors to monitor emissions. The light may flicker if the exhaust slightly exceeds standards, the fuel quality is poor, or there's a minor issue with the computer system. But this doesn't mean every China VI vehicle will experience this—it largely depends on the brand's quality and driving habits. From my experience, using fuel from reputable gas stations and regularly maintaining and checking the sensors significantly reduces the chances of the light coming on. Once, my car's light came on, and a visit to the 4S店 revealed it was just dust on the oxygen sensor—cleaning it fixed the issue with no major consequences. In short, don't worry too much; it's not a common issue but more of a teething problem with new technology.
I encountered this issue right after buying my China-6 compliant new car last year and got quite startled, thinking the car was broken. After consulting some friends and mechanics, I found many people had similar experiences, though not all China-6 vehicles behave this way. It’s mainly because the new emission standards are too stringent—the sensors and computer systems are extremely sensitive. Even slight instability in the air flow meter or exhaust treatment system can trigger the warning light. However, it’s usually not a serious problem. For example, when I drive in the city with frequent traffic jams, exhaust buildup may cause the light to flash, but it often resets after restarting. I’d advise new car owners not to panic in such cases—first check the fuel quality or air filter, and if that doesn’t help, visit a professional shop to read the fault codes with a diagnostic tool. The fix is usually simple. Don’t let it disrupt daily driving; most cases are just minor hiccups.
I've been working at the dealership for several years and have dealt with quite a few cases of malfunction indicator lights (MIL) coming on in China VI vehicles. It's not a universal issue, but it does occur more frequently because China VI emission monitoring is stricter, and sensors like pressure gauges and thermometers often have minor faults. Poor fuel quality, excessive carbon buildup, and slow ECU software updates can all trigger the light. In most cases, simple maintenance is enough to resolve it, and it doesn't affect safety. Regular maintenance can help prevent it.
