P0016 issues

[ChazGTI]

The dreaded P0016 code has been putting my check engine light on as of late, fault frequency count is at 13 now.
Specifically -002 - Incorrect Correlation - Intermittent.
My issue is I have not had any actual symptoms. Starts quickly, pulls great
I did cambelt kit just over 1 year ago (about 5k miles). I also did the cam chain kit at 110k pre-emptively, now at 159k. Stage 1 map for the last 70k or so. Oil and filter change just 2 months ago, oil level just checked and fine.
On group 91 VCDS shows 1 - 1.5 degree deviation between cam spec and actual at any time, at about 24.0 degrees, which is expected as my engine is AXX
Group 93 shows Phase position bank 1 at -20 degrees
This should obviously be between 0 and 4 degrees or so, so something is seriously wrong here. How am I not having serious issues?

I have put a metal pole against the cam chain cover and up to my ear when idling, I can't hear any rattling etc, chain sounds to be moving quietly.

There are no other fault codes, no misfires etc.
Really not sure how to approach this as all work is up to date.
Any ideas?

[mjmallia]

The cambelt could be a tooth out

[ChazGTI]

I think this must be the case.
Took the cam sensor out and cleaned off some swarf, but phase position still reads -20.
Gonna have to take a look at the belt, wish the top cover wasn't such a pain to get off.

[pudding]

I reckon you got the inlet cam a tooth off at the chain end.

19 teeth on the sprocket.  360 degrees divide by 19 = 19 degrees.

Seems to fit the symptom but will obviously need checking and confirming.  It's a lot easier to get the chain end wrong as the belt end has 2 alignment marks, so is a pretty straight forward job.  The intake cam needs tweaking into the right position when fitting the chain, so it's dead easy to get it a tooth off.  VW use a special tool that hooks into the vacuum pump slot in the cam for that job.

[ChazGTI]

I reckon you got the inlet cam a tooth off at the chain end.

19 teeth on the sprocket.  360 degrees divide by 19 = 19 degrees.

Seems to fit the symptom but will obviously need checking and confirming.  It's a lot easier to get the chain end wrong as the belt end has 2 alignment marks, so is a pretty straight forward job.  The intake cam needs tweaking into the right position when fitting the chain, so it's dead easy to get it a tooth off.  VW use a special tool that hooks into the vacuum pump slot in the cam for that job.

That makes a lot of sense too. I did the chain kit 6 years ago though, and I have only been getting the P0016 recently.
I will have to get the covers off and inspect everything on the chain side. Probably worth a look to see how the tensioner etc are holding up.

[pudding]

Weird it's only shown up now then!  Maybe the oil control solenoid has packed up?  Try unplugging it and see if the numbers change.