The engine P220A code seems a kind of powertrain problem and this problem is not easy to solve. Like the all car engines, the engine process works especially advanced hydraulic lifters which is known as switching roller followers for the engine P220a code intake and finish valves. The lifters can be distorted by disengaging an inner locking pin. The locking pin is detached using solenoids to modify oil compression fed into the lifter. The oxygen (02) sensors of your car quantity the oxygen in the finish to regulate how rich or lean the proportion of fuel and air are in the cylinders.