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Old 04-14-2022, 12:58 PM   #1
Panza
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2011 DGM STI Sedan

Default 2011 Subaru STI jumping codes between P2442 and P2443

Howdy friends,

So I've been chasing an engine code that seems to jump and I need a bit of support so I don't spend more money than I have to as these small fixes tend to add up.

Recently I've had issues with a jumping P2442 and a P2443 code. They both seem to be related to the Secondary Air Injection system valves. I've removed the intercooler and sprayed the air injection system with WD-40 and PBB which clears the codes temporarily but it always seems to return back to one of these two codes.

P2442 - Secondary Air Injection System Switching Valve Stock Open (bank 2)
P2443 - Secondary Air Injection System Switching Valve Stock Closed (bank 2)

Is there an alternative fix to this, or am I left replacing a nearly $400 part?
Thanks guys
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Old 04-15-2022, 12:55 PM   #2
Panza
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RockAuto solves the day.
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Old 04-15-2022, 01:48 PM   #3
timpala11
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RIP 19 WRX & 16 FXT

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From everything I read you would have to replace it or remove the system and have the CELs tuned out. I don't have a problem with mine for now but I will be removing it when I have the chance.
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Old 04-15-2022, 04:20 PM   #4
Panza
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Quote:
Originally Posted by timpala11 View Post
From everything I read you would have to replace it or remove the system and have the CELs tuned out. I don't have a problem with mine for now but I will be removing it when I have the chance.
Yeah... I know that many people remove the system. I'm in a fairly strict state (Massachusetts) which insists it should stay in the vehicle. Also, removing the system would require a tune for the car.

After replacing the system, I'm considering if there's a lubrication or maintenance schedule that should go into the valve to prevent it from seizing again before natural condensation makes it rust out again. 11 years isn't a bad run though.
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Old 04-19-2022, 05:41 PM   #5
Panza
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Thought replacing the valve would be the solution but the P2443 code still persists. I inspected the internals of my secondary air valve and the condition was fair and there were no visual traces of rust that I could see.

I've reset the battery since replacing the valve and it seems to only trigger upon starts in the first/morning start up. Driving the car while it's warm does not trigger the P2443 code.

I wonder what else could be causing this issue.
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Old 11-02-2022, 06:51 PM   #6
Kaleb2011STI
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Quote:
Originally Posted by Panza View Post
Thought replacing the valve would be the solution but the P2443 code still persists. I inspected the internals of my secondary air valve and the condition was fair and there were no visual traces of rust that I could see.

I've reset the battery since replacing the valve and it seems to only trigger upon starts in the first/morning start up. Driving the car while it's warm does not trigger the P2443 code.

I wonder what else could be causing this issue.
Did you ever figure it out? Iím having the same issue. Even after replacing the valve I still get a P2443 code
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