engine code p0022 2006 tacoma

hello,

my name is cory , just bought a 2006 toyota tacoma double cab 6spd 4x4 i was test driving this truck for two days before i bought it had my mechanic check out and everything looks good right....well just so happens as soon as sighn the papers seems like the truck is falling apart and theres nothing they will compremise on first the (TPMS) light starts blinking on well i know enough to realize when i have a flat or if i need air in my tires so i pulled the wire out of the module and grounded it .(no more light). then i start hearing this chirping noise from around the tranny, can put my foot on the clutch just about a inch or so and the noise goes away...correct me if im wrong 99% chance its the throw bearing "right" .. so i let it go untile i just cant shift is my guess from here. But now something thats really messing with my head is that my check engine light is on , i went to autozone to read the code it sayes ( p0022, intake (A) camshaft position timing over retarded) (bank 2) the sensor is a $99.00 but then after driving for a few the light is off im confused is it bad or what i dont much about toyotas or the new efi engines and to go even further its vvt-i help please i dont want to have to put alot of money in thing. everyone told me yeh go for it its a toyota it will go forever