There is no "probably" that the timing could be off a tooth.
Either the timing is off a tooth or it is not. The belt timing is very easy to check and verify. Pop the upper timing cover, 2 clips, rotate the crank until the lower timing mark is aligned and then verify the camshaft mark.
If the cam timing is correct, then likely you have sensor issue.
Keep in mind that even if the timing belt is not off a tooth, you may want to replace the timing belt, water pump and tensioner to keep the engine alive for another 80+k miles.