2007 Accent, code P0012, checked CVVT valve OK, wiring to and from PCM OK. Found cvvt oil filter dirty, replaced did not solve problem. I'm thinking the CVVT control gear is bad.

cut off = engine stalls p0016(vvt failures) did you look this up first? in a real kia book?
spectra not spectra5
no engine size told. hummmm, 2.0L Automatic?
autozoned parts are junk, china cloned parts are.
so guessing and adding bad parts gets you where? double bad now.

BOOK words to follow

Trouble Code: P0016 (2.0L L4 VIN - Auto)
Crankshaft Position - Camshaft Position Correlation (Bank 1 Sensor A)and read this.
The CVVT (Continuously Variable Valve Timing) system is installed to the chain sprocket of the intake camshaft. This system controls the intake camshaft to provide the optimal valve timing. The PCM controls the Oil Control Valve(OCV), based on the signals output from mass air flow, throttle position and engine coolant temperature. The CVVT controller regulates the intake camshaft angle using oil pressure through the OCV. PCM monitors timing misalignment while no active faults are present and fully warmed up engine oil at idle. If the timing is misaligned PCM determines that a fault exists and a DTC is stored. Possible Causes:

• * Oil level, pressure and condition
• * OCV
• * CVVT
• * Timing mark alignment

note their words, 4 thing wrong, here, VVT is bad.

cam shaft sensor error is
Trouble Code: P0340 (2.0L L4 VIN - Auto)
Camshaft Position Sensor Circuit Malfunction and you never got that code,

I would suggest a compression test to ensure that all the damaged valves were replaced. Replace the MAF sensor as it appears that it is faulty

The CVVT (Continuously Variable Valve Timing) system is installed to the chain sprocket of the intake camshaft. As you have said you've replaced all the sensor, given quality parts most of what I see when this code happens is plugged passages within the variators themselves or the cylinder head. you might have some luck with a good engine flush and change oil change intervals to 2000 miles for a year.

P0012 - "A" Camshaft Position - Timing Over-******** (Bank 1)
OBD-II DTC Trouble Code Description

"A" Camshaft Position - Timing Over-******** (Bank 1)
What does that mean?

A code P0012 refers to the VVT (variable valve timing) or VCT (variable camshaft timing) components and the car's PCM (powertrain control module, also called an ECM). That consists of a few different components but the P0012 DTC specifically refers to the camshaft (cam) timing. In this case, if the cam timing is over-********, the engine light will be illluminated and the code will be set. The "A" camshaft is either the intake, left, or front camshaft.
Potential Symptoms

Most likely a P0012 DTC will result in one of the following:

hard starting
poor idle and/or
stalling

There are potentially other symptoms as well. Of course, when trouble codes are set, the MIL (malfunction indicator lamp, a.k.a. the check engine light) illuminates.
Causes

A P0012 DTC trouble code may be caused by one or more of the following:

Incorrect camshaft timing
Wiring problems (harness/wiring) in intake timing control valve control solenoid system
Continuous oil flow to VCT piston chamber
Failed timing valve control solenoid (stuck open)

Possible Solutions

The main thing to check is to verify the operation of the VCT solenoid. You're looking for a sticking or stuck VCt solenoid valve caused by contamination. Refer to vehicle specific repair manual to perform component tests for the VCT unit. Notes: Dealer techs have advanced tools and the ability to follow detailed troubleshooting steps, including the ability to test components using a scan tool.

P0011 "A" Camshaft Position - Timing Over-Advanced or System Performance (Bank 1)
P0021 "A" Camshaft Position - Timing Over-Advanced or System Performance (Bank 2)

no
they are different items
get a quote from an accredited service center on the CVVT system
have the fault codes read as it is normally a solenoid or servo that needs replacing
it is a unit that changes the valve timing for different engine speeds and is less than the price suggested

The CVVT (Continuously Variable Valve Timing) system is installed to the chain sprocket of the exhaust camshaft. There is no variation in valve timing of the exhaust cam because the exhaust camshaft is driven by the timing belt. The timing of the intake cam is varied by the relative operation the CVVT vane to the housing. This system helps the engine decrease exhaust gases and increase engine power and fuel economy by changing the valve open/close timing of the intake camshaft.

The code you are getting can be caused by a mechanical problem with the CVVT or with an Engine Control Module (ECM) malfunction. The most common cause of a mechanical failure of this system is debris clogging the very small oil ports that control the position of the CVVT vane hub. Improper oil viscosity can affect this as well as deposits caused by not changing oil at the specified intervals.

There is a Technical Service Bulletin (TSB) that deals with properly checking the CVVT system for mechanical/electrical failures. It is bulletin Number 09-EM-002.

dear friend-did the rebuildersnot damage the turn wheel.or is the wiring to the sensor not damaged.

The CVVT (Continuously Variable Valve Timing) system is installed to the chain sprocket of the exhaust camshaft. There is no variation in valve timing of the exhaust cam because the exhaust camshaft is driven by the timing belt. The timing of the intake cam is varied by the relative operation the CVVT vane to the housing. This system helps the engine decrease exhaust gases and increase engine power and fuel economy by changing the valve open/close timing of the intake camshaft. The deviation of the camshaft position from the target point is evaluated during stable driving condition. The PCM accumulates this deviation for a certain period and sets DTC P0010 when the accumulated deviation is too high. The target camshaft position is a predetermineded value depending on engine speed and throttle angle communicated to the PCM. The MOST FREQUENT CAUSE is DIRTY OIL. The NEXT most frequent cause is restriction/obstruction of OIL FLOW to the CVVT unit (oil control valve supplies this). Remove this valve & inspect it for aluminium flashing (bits of metal which might be interferring with the valve's operation). We use Z-MAX treatment to solve this problem at our service center (after changing oil & filter (genuine Hyundai Oil Filter).

You mention the oil control valve,so you have a 2 litre petrol engine with cvvt then?Sometimes you can remove the oil control valve and clean it out and re install it and an oil change with nice clean oil is good for them too.The ocv valve is located when plastic engine cover is removed,on the front rh top of the cyl head with an electrical plug on it.