Vehicle: 2005 Subaru Outback 2.5 XT Limited MT
Issue: Reoccuring P0011 and P0021 codes
I took my vehicle to a local shop to have some maintenance issues taken care of before I jumped into suspension/power modifications. The inital issues I was addressing were:
Stripped spark plug socket--one plug kept backing out.
Slight oil leak near the oil filter.
Slight oil leak near the turbo.
While the vehicle was in the shop, I also had the timing belt, tensior/idler pullies, and water pump replaced. Had the Killer B oil pan, oil baffle/windage tray, and oil picked up installed. The IP&T full AVCS oil line kit, new OEM oil control valves, new OEM oil cooler, 11mm STi oil pump, and a handful of other hoses that were worn/deteriorating. I also had to the tubro sent to Six Star Speed, LLC for them to refresh it. What they told me was that it was showing signs of wear, but no where near failing with only very minimal shaft play--overall though, wasn't in bad shape at all.
After all the work was done. The shop put on about 100 miles to make sure everything was put back together correctly and there were no issues. After I got the car back, within 25 miles I got a CEL (P0011).
I took it back to the shop, where they changed the oil from what they put in initally (not 100% sure what it was) to Rotella T6. After another 15 miles or so the CEL came back.
I returned the vehicle to the shop again. The p0011 and p0021 both codes kept coming up either one at a time or both would send together. They checked the oil filters and replaced the other banjo filters with the revised banjo filters from subaru, checked oil pressures and found they weren't to spec. from what Killer B recommended (after inquiring to them if they might know the cause to the code). So they replaced the STi 11mm oil pump with the OEM 10mm? oil pump. This still didn't resolve the issue. They also replaced one of the new oil control valves as welll. They also checked to make sure my timing was still in alignment and I hadn't jumped a tooth. After all this didn't solve the issue, they sent it to a Subaru Dealer.
The dealer wasn't sure what the issue was. They conducted an oil flush as well as replaced the adjustable cam gears. This seemed to resolve the issue and I drove the vehicle for nearly 400 miles, only to the the P0011 code return.
At this point I (who am not mechanically inclined) am at a lost as well as my mechanic. He's not a subaru specific mechanic, but has been fair and upfront with me. Since paying for the inital work, I haven't had to pay for anything and he even lent me his car while mine was being worked on.
If anyone has any tips, suggestions, or advice, I'm more than willing to listen, or if anyone knows of a good subaru mechanic in the Houston area, that may be able to help that would be appreciated as well.
Apologies for the long post!