Thread: P0021 code??
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Old 04-26-2017, 09:35 PM   #45
Subie_
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Member#: 419354
Join Date: Apr 2015
Chapter/Region: MAIC
Location: Delaware
Vehicle:
2007 STI
Crystal gray metallic

Default P0021 code??

Quote:
Originally Posted by Dreamtribejay View Post
Ill tey to do this in the next few days.. What exactly will this tell me and how would it happen?
They're high speed switching transistors that control the oil control valves. If one is toasty then the corresponding AVCS will not function and you're in for a new ECU.
They're unlikely to fail, but super easy to check.
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