p0341 crank position sensor error

Can someone help me understand this error.I replaced my timing belt on my 1996 2.0 Jetta.I used the manual I purchased at autozone for directions.I turned the crankshaft till the #1 cylinder was a tdc also I looked in the window on the bell hosing .I noticed a circle and a line also there is 2 openings one is a circle the other is oval.I removed the plug from the number 1 cylinder and was able to get tdc by placing the circle on the front edge of the oval opening.The manual is quite confusing so I used this as a reference.I turned the crank so the tdc marks where right on.Put the belt on tightened it down put all back together and she runs fine.Except for the ck engine light.po341 error.I cked and rechecked the timing but I am not sure if I am setting the crank correctly even though she runs excellent.Can anyone please advise the correct way to do this adjustment.