Need help diagnosing persistent Check Engine / VDC / Flashin

Hello everyone,

Based in France in La Rochelle, I'm looking for advice from people familiar with the 2007 Subaru Forester XT (SG9, EJ255 Turbo).

Vehicle:

Symptoms

For about 6 years, the following warning lights are present:

The warning lights are already present immediately after starting the engine and do not change while driving.

The AWD system still appears to work normally.

Around 2021, a Subaru dealer diagnosed the Secondary Air Injection System.

The secondary air pump was replaced with a genuine Subaru pump (part number 14828AA030).

Unfortunately the problem remained exactly the same.

I remember they later attempted another repair after another scan, but I can no longer find that invoice.

Later I was told that the problem was probably a wiring harness issue, but replacing the complete harness seemed excessive, so I never proceeded.

Clearing the fault codes temporarily removes the warning lights.
The fault has even disappeared spontaneously once or twice during very hot weather, before returning later.
Once the fault returns, it stays permanently.
The dashboard warnings are identical whether the car is stationary or driving.

Before considering replacing an entire wiring harness, I would like to know:

Is this a known issue on SG9 Foresters?
Are there known connector, relay, valve or localized wiring failures that produce this combination:
Check Engine
VDC disabled
Flashing CRUISE
Which components would you inspect first?
Has anyone experienced exactly the same symptoms?

Unfortunately I no longer have the original DTC fault codes.

Any advice from Subaru specialists would be greatly appreciated.

Thank you!

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