Valve taps often occur as a result of a misalignment in the fitting they are in, or a worn out valve seat. In many cases, a new valve spring and cam adjustment will fix the problem, but if it the result of a worn out valve seat, it will have to be machined.
The problem that occur in the brain is the Mental Problem.
No, not unless there is a problem with the valve which is rare.
What kind of valve? Exhaust valve? EGR valve? PCV valve?
Loose, broken, or worn valve train component. Remove the valve cover to find the problem.
There is no need to reset it there is way to reset it if the valve is a problem it has to be replaced I think there is another problem but I have no way of knowing what it could be
EGR valve related
Aortic valve stenosis can occur because of a birth defect in the formation of the valve. Calcium deposits may form on the valve with aging, causing the valve to become stiff and narrow. Stenosis can also occur as a result of rheumatic fever.
A bad PCV valve can cause the engine to smoke. The valve is easy to change in most engines to correct the problem.
This code indicates a problem with the EGR valve's pintle position. The EGR Valve's pintle could just be stuck in which case the problem could be fixed by cleaning the EGR valve. If the EGR valve is electronically controlled or cleaning the valve does not fix the problem, you will most likely have to replace the EGR Valve. Keep in mind that the EGR valve relies on inputs from other sensors to determine the pintle position. If one of these other sensors is not operating correctly, it could be giving you a false P1406 error code.
It is seeping oil into the cylinders when it's not running. It could be old valve guide seals. These will allow this type of problem to occur.
the car will most likely not start