In my never ending quest to keep my aging 2004 WRX functional, I’ve started to look into my wobbling boost pressures. One suggestion I heard was that, after hundreds of thousands of miles, it’s unlikely that the original boost control solenoid is still working at peak efficiency. That seems pretty reasonable, considering that it has been working non-stop for every mile.
The problem is that I can’t find the OEM part number for the solenoid. I’m not looking for an after-market part as I don’t want to retune. I’m just trying to find the OEM part and do an in-place replacement.
I’ve been through my standard part websites but the diagrams and part selections all seem to be missing the solenoid itself.
NOTE: I’m not looking for the blow-off valve. That seems to be working just fine (and is a different part).