horsementech

So as of now, plugs have been changed & upstream O2 replaced. Codes have been cleared and lights are out.....sort of. CEL is out and cruise is no longer on, however the VDC light is. Also reflowed the solder joints on the overhead console to get rid of the airbag light issue that showed up. So as of now the problem seems fixed, but usually takes a day or so depending on driving for lights to come back. So now I get to try and figure out the other lights. I also just recently had new tires put on and ended up replacing two bad TPMS sensors, however the light flashes and goes solid still although all sensors have been re calibrated and are showing good. It keeps changing, sometimes it is on and sometimes off within a matter of a few minutes. I have read that the VDC could be something as simple as needing brakes which is next on my list, but TBH I haven't checked them out yet. So, the saga continues. Thanks for all of the suggestions so far.

Well, I went and bought a set of NGK platinums and found out a big issue. Apparently the mechanic that replaced the motor didn't listen about putting original plugs back in. In fact I'm not even sure they replaced the plugs at all. It was running Autolite garbage gapped at .046. Scanner will be in tomorrow so I will be able to have more info on how it is actually running. Sent from my SM-N960U using Tapatalk

OBD2 scanner has been ordered and should be here by the weekend. O2 sensor is a Denso. Will probably be picking up different plugs today or tomorrow. Any particular NGK better for Subaru?

Before anyone says did you do a search, the answer is yes and it yields many different possible problems. Back story, bought a 2009 Legacy 2.5i and it ran great....shortly after purchasing I noticed a growl coming from the rear of the car. Replaced both rear wheel bearings and sound is gone. Within a month I had to replace the clutch. These are not the cause of the trouble code, just giving some insight on my frustrations on what I thought would be a great car. When I bought the car I also decided to do an oil change and spark plugs as I had no idea when they had been done last. I opted to go with a plug that I was unfamiliar with but seemed to have good reviews. They are the E3 Diamond Fire Spark Plugs. Shortly after this is when the Christmas tree started happening. Needless to say since then apparently there was an oil leak that just poof drained the car and the engine needed replaced. The mechanic replacing the motor was instructed to swap the plugs from the old motor as they weren't that old and weren't cheap. The code was still present after the engine swap and since then I have replaced the upstream O2 sensor as I was told that was the culprit. Unfortunately the code still persists. So I guess the question is, could the cause be the E3 plugs messing with the fuel/air mixture readings by the O2, or is a bad downstream O2 or catalytic converter the issue? Thanks for any insight