What are the reasons for BYD DM-i engine failure?

[VonEmersyn]

Specific reasons for BYD DM-i engine failure: 1. Irregular maintenance: Engine failures caused by poor maintenance account for about 50% of total vehicle failures. 2. Incomplete combustion: Poor engine combustion state is the main reason for the engine warning light to illuminate. In automotive design, an oxygen sensor is installed to monitor the engine's combustion state, ensuring the engine operates in good condition and maintains a normal working lifespan. If the combustion state is poor—such as high levels of hydrocarbons, carbon monoxide, or nitrogen oxides—it not only pollutes the environment but also leads to fuel waste and excessive engine wear. 3. Engine knocking: The engine is equipped with a dedicated knock sensor to monitor knocking. Engine knocking can potentially cause severe mechanical damage or significant power loss. Typically, knocking is categorized into noticeable and unnoticeable knocking. In cases of unnoticeable knocking, the engine control unit (ECU) adjusts control parameters to mitigate adverse effects. However, if the unnoticeable knocking exceeds the ECU's adjustment range, the engine warning light will illuminate as an alert.