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The saga continues.... Took the car to the closest dealership (which happens to be in another country, but such is life) and told them the whole story. They performed their diagnostic and came to the same conclusion as me : cam sensor. I told them (more than once) that it's already been replaced but they thought this was the best course of action. So, ok....you're the experts. Change the sensor. No luck. And lots of money spent on wasted labour. So on to the wiring harness. They replace that and it ran great for a few days....but by now we're into spring and the cold weather has left....until this past weekend. A fresh powder of snow and freezing temperatures Saturday morning at the end of March and guess what....the problem returns, complete with rough idle, stalling and P0340 code. So now I'm out $1300 with no resolution. And I don't want this to become my "summer car" just because it doesn't like the cold. Any ideas? I did find another site that listed various causes for that code and a faulty CRANK sensor is actually a possibility, although I've never seen that code come up. I'm also getting intermittent misfire codes (P1301) and exhaust temperature codes (P1544) which I'm assuming is a symptom of the ignition timing being out of whack because of the actual root cause, whatever that may be. But the one consistent code is always the P0340 (cam sensor circuit A). So now what? I'm thinking the next thing is to find a cheap (ie. used) ECU and see if that makes a difference. Or at least remove mine and check the connections? Yes? No? Please share your thoughts, folks. Any feedback would be appreciated. Thanks for reading, $$$

Well, I tried getting at the passenger side sensor and had no luck. I couldn't get at it because there's a detail on the engine directly above it that interferes with me getting a socket onto the 10mm bolt. I brought it in to my mechanic and had him replace the sensor. It started up better (fewer cranks) and ran great with no issue the first time I drove it. A few hours later however on my second trip, the same symptom and same code came back. So now I'm thinking wiring harness, unless it's possibly the other sensor, but a couple of the above replies indicate it's the passenger side. So I guess I have some more research to do. Thanks again for all the help. More updates as I have them. $$$

Wow, Max, thanks so much for the service manual! That should help tremendously. I was about ready to give up, but since you're all telling me it's the passenger side, maybe I'll give it another go on my own. I'll invest in some socket attachments and will let you know how I make out. Thanks to everyone for the help! $$$

Hi. I'm brand new here, and a brand new Subaru owner as of Oct. 2018. I realize this is an old post, but hopefully my reply will get noticed. Anyway, thanks for the post jmcgliss. It helps me a lot to confirm my suspicions. I also have a '05 Legacy GT MT Sedan and it's running very rough and stalling and gives code P0340 (cam position sensor A circuit). The funny part is, this problem didn't really appear until the weather changed in November. When it's cold outside it runs fine at first. Then as it warms up, there's a "sweet spot" (or sour spot, in this case) where it will run rough and stall and is very difficult to keep running and restart, etc. Then once the engine is nice and warm, it runs great again. And as I said, it gives the P0340 code. Also, once it's warm, I can clear the code and it doesn't come back until the engine has had time to cool below the "sour spot". Rinse. Repeat. My question is, how did you know which sensor to replace? I looked on other forums and youtube and such and it seemed easy to get at. So I bought a sensor with the intention or replacing it myself. Unfortunately real life proved dramatically different. I tried getting at the driver side one yesterday and it was impossible for someone with my limited space, tools, ability and courage. And it was freezing in my garage, so that didn't help. Anyway, just wondering if it's worthwhile trying to get at the passenger side sensor. It looks a little more accessible, but I don't know which sensor is the defective one anyway. Or is it worth buying a second sensor and just replacing both? Fortunately I have a good mechanic who will let me bring in my own part and I'll just pay him for the install. Anyway, hope someone can offer some insight. Thanks, $$$