Thread: P0021 code??
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Old 04-26-2017, 10:49 PM   #47
Scooby Newbie
Member#: 432274
Join Date: Oct 2015
Chapter/Region: MWSOC
Location: Kalamazoo MI
2011 Forester


Originally Posted by Subie_ View Post
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.
Ive never removed a ecu but im sure it cant be to bad. Ill see if i get some free time tomorrow and do it.
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