What Causes Engine Fault Codes?

[Petunia]

Engine fault codes can be caused by issues such as carbon buildup on spark plugs and poor fuel quality. The specific reasons are as follows: Carbon Buildup on Spark Plugs: After some time of use, the engine accumulates carbon deposits, which can lead to engine damage, difficulty starting, poor acceleration, excessive engine noise, and other issues. The accumulated heat can cause irregular ignition, resulting in engine knocking. In such cases, the engine fault light will illuminate. Poor Fuel Quality: Substandard fuel quality. Some drivers may notice the engine fault light turning on immediately after refueling, which is usually due to filling up with low-quality fuel at non-standard gas stations.