Engine shows fault code, acceleration is weak, what could be the reason?

The check engine light is on, indicating an engine emission fault, but the DPF regeneration indicator is not lit. Holding the regeneration button doesn't work, and sometimes the vehicle doesn't accelerate properly. What could be the reason for this? Any ideas, everyone?

After the power reset of the Coaster, the fault code light is on and it can't accelerate. What's going on? Can any expert advise, please?

The trunk suddenly won't open, and it's showing that the trunk is unlocked. What could be the reason?

Why does the transmission often show a fault code and then disappear on its own shortly after?

The 2014 Zhiya's Blind Spot Detection (BIUS) system showed a fault warning in July this year, but today the fault disappeared and the feature is working again. What could be the reason?

Even after changing the middle exhaust pipe, the fault light is still on. What could be the reason?

I was driving a Haima S5 1.6 CAT Creative Edition on the highway for about 6 hours, and suddenly the car couldn't accelerate. After stopping and turning off the engine for a while, it could accelerate again. What could be the problem? This has happened twice already, once on the highway before and once this year. When it couldn't accelerate, the car showed a fault code, but after parking overnight, the fault code disappeared. Has anyone else experienced this?

Engine shows fault code, acceleration is weak, what could be the reason?

What could be causing this issue with the 2011 Volvo C30? When shifting to 2nd gear, the engine makes a buzzing noise. There are no fault codes, but there is a throttle body fault code for the engine.

The engine won't start, and the EPC, battery, and engine fault lights on the dashboard are all on. What could be the reason?