Rebuilt head. Runs good but still has codes
 

Yes, I made a mistake. I went to do a timing job and somehow got it off a few teeth and caused my valves to bend. After taking it apart I took it to a shop and they said the cylinders were fine! Had the head rebuild, new coil pack and spark plugs and its running pretty good! Only one problem. I have codes P000A, P1497 and P0012. What is happening is that the car with surge back and forth minorly and rpms will go up and down very suddenly when idling. If I get on it you can tell there's hesitation but it still takes off. I did some research and thought it was a bad PCV hose (hard plastic one) so I replaced it with no results. I personally think it's a bad O2 sensor but the codes don't make sense. Its a 2007 R56 N14 with 115,000 miles. Its going about 2,000 miles since the rebuild. I did, in fact, take it to a shop to have the timing confirmed for those who might ask. Anyone have any ideas? Thanks in advance.

Check your spark plugs for cracks, I had two brand new plugs that caused the same issues.

Pull the VANOS solenoid and inspect the screen for debris, then if that checks out recheck engine timing. P0012 is for intake cam over retarded and the P1497 is an unmetered air leak, both of which relate to either the VANOS solenoid or the engine being out of time.

Quick question. Took the valve cover off and the marks on the cams are at tdc. Is that enough to check the timing? Next is checking the sensors

Update: Checked Vanos and it seemed to be clean. Cleaned it off a bit more with no results. Pulled the valve cover once again to just look at the markings on the cams. I would say the lettering on one of them is just a hair off not even a mm. Is that enough to throw everything off?

You may need a VANOS solenoid still, they don't always give a failure code for the VANOS solenoid.

I would recommend finding a scan tool that will read real time values and watch the VANOS actual vs requested to see if it's functioning properly.

When the work was done, was the tensioner tool set too tight and thus loading the VANOS sprocket during torque procedures on the cams? If the VANOS sprocket was loaded during the tightening of everything that can/will give cam position faults as well.

Sounds good I will try and get the vanos tested. After I messed it up the first time I had a mechanic rebuild it from his garage. So I am unsure about the torque procedures on the cams. Now he wants nothing to do with it. I guess I will have to re - do the timing job is what I'm seeing.