About a month old and 1.7k miles later after purchase, I got P0390 and P0391. Brought it into the Morries Brooklyn Park, and they replaced the camshaft position exhaust sensor. A couple hundred miles later, the same exact codes came back. The car is 100% stock minus the snow tires. Can't think of anything else that could be causing this. Anyone have a clue? I'll most likely drop it off at the dealer again tomorrow.
P0390 = Bank 2 Exhaust Cam position sensor circuit (open or shorted, no signal). P0391 = Bank 2 Exhaust Cam position sensor performance (intermittent signal interruption). If it takes a couple of hundred miles to reproduce the failure, diagnosis will be very difficult. A DSO (digital storage oscilloscope) is the right tool to see the sensor signal pattern and to see if it is dropping out because of a poor connection or wiring problem when the harness is manipulated. Todd
Sigh... So it sounds like it's something electrical. Something tells me I'll be making a few trips to the dealership.
Yea, the best thing you could do it try to pay attention to see if there is a reproducible pattern of when the codes sets.
Would you suggest visiting the dealership ASAP each time the CEL goes off? I'd almost just want the dealer to just keep the car for a while until they can put some miles on it. It's kind of annoying when I have to drive two cars just to drop the WRX off. Morries BP Subaru doesn't have loaners. Haven't tried other Subaru dealers yet. I'm guessing it's probably best to one dealer to figure out patterns.
I would take it to Morries Minnetonka Subaru each time you have an issue. Its a bit longer of a drive but they have stellar service and loaners to boot. They may keep it for a while to diagnose. Otherwise, @Sjogun is a tech at Bloomington Subaru and he's worth the drive.
We've got a TSB for the 13 Scion FRS/Subaru BRZ which may relate. The sensor to tone-ring clearance wasn't as closely controlled as was needed, so in some cases we have to shim the sensors out to achieve the proper tooth to sensor gap. I'd think if there was a TSB for your car the tech would have noticed, but it's worth letting you know.
There was a bulletin for the 13MY Impreza...I wouldn't be surprised if they come out with a new one for the 15 WRX soon.....If it is a common occurrence.
Good point. I'm guessing SOA only comes out with a TSB if there are enough customers receiving the problem. Just because there isn't an official TSB for the MY15 WRX doesn't mean it doesnt have the same issue.
Just spoke with the Service Advisor. He said the tech told him the TSB didn't apply to the WRX, and there were no ECM updates available. There will be some "technical" guys tomorrow coming into the dealership to do further diagnosis. If that doesn't resolve it, they have some Subaru Field Engineers coming on Wednesday.
We should move the Tuesday night pub meet to Wednesday this week and invite them, I bet we could give them an earful on what Subaru needs to fix
Update 2/17/15 Service Adviser said they replaced the camshaft position sensor on the other side. Corrosion was found on the connection. Apparently the CEL code that came on the first time was for the other side. They're going to put some miles on the car to see if the CEL comes up again. I advised them to plug a reader into the car to see if there were any "hidden" codes before they return the car back to me. I'm not 100% convinced that both sensors were corroded and caused the CEL on a car this new, but what can you do. Maybe they'll start looking at the electrical side if I bring in the car for the third time.
Its possible if there was a manufacturing defect on the sensors that both were at risk. Hopefully its simply a non-issue now but keep a watchful eye.
LOL this is exactly what I thought when I saw the thread title. After several years, I finally convinced my parents to buy a Subaru. Less than 10k miles into their '15 outback, both front wheel bearings went bad. Poo poo on me for that suggestion. Anyway, I sure hope these are a few small fluke cases! I can't be that pessimistic either...I still drive two of the darn things.
