I have been through a number of threads with this issue and every remedy mentioned has not worked.

I have a 2004 WR1, and this fault has been driving me crazy for quite some time.

what have I done so far:

• swapped the sensors round to see if the fault code changes. No change.
• renewed the AVCS loom complete, from JTI Innovation. No change.
• I sent my ECU of to be checked for any issues, sent to Autotronics in Leicester. No fault found within the ECU.

I think I am left with some options, which may be clutching at straws, these options are:
 

• check the timing. I have done this for it looked slightly off, but was told this can be quite normal. I’m not too sure. Have a look for yourself
  Bank 1 aligned correctly
  Bank 2 slightly off

The cambelt was put into be replaced 2 years ago, but on looking at it, it looks a lot older. I am thinking that the garage that did the job may not have done so, therefore, the belt and the tensioner may not have been changed. If the timing is out slightly, would this not throw a fault in the cam position?

as I said, I am clutching at straws and I want to drive the car without the dreaded engine light coming on after driving for a few minutes.

Hi,

Have you tried replacing the camshaft position sensor B on bank 1?

I recently had the code P0340 for camshaft position sensor A on bank 1. Brought a new sensor for $50 from Rockauto (sensor and postage), replaced the faulty one and now my Outback runs like it used to.

https://www.yourmechanic.com/article/p0365-obd-ii-trouble-code-camshaft-position-sensor-b-circuit-bank-1-by-valerie-johnston
 

Hi mate.

Any chance you found the solution to this? I believe I'm having the same problem.

Hi! Any updates? Did you find what was causing the problem? Having the same problem on my 05 legacy spec b. Just changed the camshaft sensor and no difference, going to check the wires and timing belt next...Thanks!

Okay so i found what was causing the p0365 code in my car. It was the exhaust camshaft sensor on the right side of the engine.(Side that has the airbox on it). Its located on the bottom front of the valve cover under a plastic piece. I read a bunch of forums and all i heard was that the car only had 2 camshaft sensors on the top of the engine, so i don't know if other ej20s only have 2 sensors.  My legacy is a Japanese import and the engine code is ej20xdkcje. Here's the part number for the sensor 22056AA150. And here's some more info with pictures (its in Japanese) https://www.goo-net.com/pit/shop/0127346/blog/149352