What's wrong with Ford Focus throttle fine tuning?

Throttle oil pressure is too high or too low.

Because the fuel system pressure is too low or the injector is blocked, the fuel supply of the engine will drop sharply at medium and high load. At this time, the computer will connect/

By adjusting the injection time, the mixture is enriched to make up for the shortage of oil supply caused by insufficient oil pressure or blocked injector. But controlled by computer.

The fuel injection time is limited. Once the injection time is adjusted to the limit, the mixture will not become rich from thin, and the computer will think that the oxygen sensor is invalid and

Set the fault code. In this case, as long as the oil pressure fault is eliminated or the injector is cleaned, the voltage of the oxygen sensor will change normally.

The fault will naturally disappear.