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:

• Subaru Forester XT Turbo

• Model year: 2007

• VIN: JF1SG9LT56G077030

• France (European model)

• Current mileage: around 250,000 km

Symptoms

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

• Check Engine ON

• VDC/ESP warning

• CRUISE light flashing

• Cruise control completely disabled

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.

History

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.

Additional observations

• 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.

What I'm looking for

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!

I would start with wheel speed sensors.

Thanks.

Could a faulty wheel speed sensor also trigger the Check Engine light, or would you expect only ABS/VDC warnings?

The original diagnosis several years ago was related to the Secondary Air Injection System, although replacing the pump didn't solve the issue.

Faulty wheel speed sensor could trigger both abs and disable cruise control.

And the check engine too ?

here's the picture

You can check if one of them is faulty by plugging in a £10 obd reader that can read live values, pull up all 4 wheel speed sensors and while driving see which one is way off.

Yes it can.