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Old 09-28-2019, 08:05 PM   #1
Aphelion79
Scooby Newbie
 
Member#: 459571
Join Date: Dec 2016
Default '06 STi P0021 Code

I've been dealing with a P0021 on my new-to-me 2006 STi. Guy rebuilt the engine about 15-16k miles ago and never said there were any issues besides the fuel cap throwing a code for a small evap leak (naturally). I've done the following:
  1. Got the code and immediately Changed Oil to Mobil 1 Synthetic
  2. Within 5 days did Subaru brand oil flush and switched to OEM filter and Amsoil XL 5W-30
  3. Bought a new OEM OCV and installed it on Bank 1 (oops)
  4. Took the OCV that I removed from Bank 1 (that's the right/passenger side? correct?) and put it in Bank 2 *I also ordered a new OCV today to put in Bank 2 so they'll both be new.

But even with the Bank 1 (Passenger side) OCV now installed in Bank 2 (Driver side) I'm still getting the same code. Here is a BTSSM log I pulled:

BTSSM Log

I have it formatted so any time the Left Side VVT / Left Side Duty % exceeds the Right Side it turns the cell red.

I'm just worried if the Right side OCV was working fine and I put it in the left side and it's STILL over advanced then it's something more serious? Please advise!


EDIT: Is there a way to see the actual camshaft position from the Cam Position Sensor? A different memory address I can add a field in BTSSM with? Or is this the same as the "Left/Right VVT"? Basically, I'm wondering if the cam was advanced a tooth by accident? I looked and both intake notches seemed to line up with the notch in the head? I'll double check again tomorrow!

EDIT2: The car runs amazing otherwise! Idles fine, accelerates and cruises without a hitch!
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Last edited by Aphelion79; 09-28-2019 at 08:15 PM.
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Old 09-29-2019, 12:31 PM   #2
Aphelion79
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Member#: 459571
Join Date: Dec 2016
Default

Update: Timing Looks Fine
Update 2: Now have both OCV's replaced. Will let you know if the check engine comes back. (In the meantime I had to get a new knock sensor as mine was showing over voltage, love old cars lol) I was also kind of hoping I needed to dig into this more to make a good thread but hopefully it doesn't come back!

Last edited by Aphelion79; 10-04-2019 at 08:54 PM.
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