What does P030085 signal exceeding the allowable limit mean?

[VonValerie]

P030085 indicates misfire detection, where a signal exceeds the permitted limit value P030285, identifying misfire in cylinder 2. Below are relevant details: 1. Ignition inspection: Through disconnecting ignition detection, it was found that cylinders 2 and 3 are not functioning properly—not completely non-operational but performing poorly. After swapping ignition coils and spark plugs between cylinders 1 and 4, 2 and 5, and 3 and 6, the issue persists. 2. Fuel injector swap: The same method was applied to the fuel injectors, yet the problem remains. Subsequently, an endoscopic inspection of cylinders 2 and 3 revealed no cylinder scoring or other faults. A cylinder pressure test showed all six engine cylinders achieving pressures above 1200 kPa. After removing the intake pipe, each cylinder's intake was found to be independent. Starting the engine and manually blocking each cylinder's intake demonstrated strong suction pressure uniformly across all six cylinders. At this stage, suspicions of mechanical system faults in the engine are largely ruled out.