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I believe there is something faulty in the ECM/ECU's in theses cars. Mine (totally stock) has been throwing codes and CEL light for a couple months (it pops up along with the traction control light), usually it says it is an injector issue, or that the system can't communicate with the CANBus.
I've had it to a private Subie shop several times and after checking all the connections, the tech can't find the issue anywhere. His reader says teh same thing. We thought it might be varying voltages from teh alternator, or a bad battery. I replaced the battery and the Alt checked out ok.
Then suddenly the CEL went off. Drove a couple months, and it came back. Went out on its own, then came back.
My guess is the ECM/ECU is faulty, but it is a pricey fix.
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