What are the reasons for the Roewe i5 engine emission failure?
2 Answers
The cause of the Roewe i5 engine emission system failure is a decrease in the engine's power performance. The impacts of engine emission system failure include: 1. Increased fuel consumption, leading to excessive carbon buildup over time due to poor combustion; 2. Reduced safety during driving and shortened engine lifespan; 3. Sintering and peeling of the three-way catalytic converter carrier, increasing exhaust resistance; 4. Inaccurate fuel injection control by the computer. The solutions for engine emission system failure are: 1. Perform three consecutive starts and shutdowns or temporarily disconnect the negative terminal of the battery, wait for 30 seconds, and then reconnect; 2. Replace with qualified fuel.
I've seen quite a few cases of the Roewe i5 where the emission fault light comes on, mainly for these reasons. One is a problem with the oxygen sensor. This little device monitors the oxygen content in the exhaust, and if the data is inaccurate, the computer may mistakenly judge that emissions exceed the standard. The second is a clogged three-way catalytic converter, where poor exhaust gas treatment causes the fault light to stay on. Carbon buildup is also a common issue—accumulated unburned residues inside the engine affect combustion efficiency. Additionally, fuel system problems, such as incorrect fuel injection from the injectors or air leaks in the intake system, can lead to an imbalance in the air-fuel ratio. Another frequent cause is a stuck or faulty EGR system. My advice is not to panic when the fault light appears; instead, take the car to a professional repair shop for a diagnostic scan to rule out sensor issues. Regular maintenance, including periodic carbon cleaning and exhaust system checks, can significantly reduce these troubles.
