2003 Subaru Forester Questions

Unanswered 2003 Subaru Forester Questions

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Hello, I have a 2003 subaru forester with 166000 miles on it. A few months back the check engine light came on, but the car was running fine. Took it to a mechanic and a P0420 code came up, he said if the car is runni...
There is a leaky vent valve at the top of the fuel tank.
Picked up vehicle, told the noise was gone all quiet...have to take it back because the rattling noise is still there. I hear it starting out most of the time, i.e., accelerate hear grinding rattling from the front. M...
about how much for an emission system cap for a 2003 Subaru Forrester
Increasing idling RPM after riding in traffic for 10-15 min. It's rising even more after shifting to neutral or parking.
I am wondering if anyone has any experience or answers as to what could be causing my automatic 4 cylinder Forester to randomly rev the tachometer and engine from 1500 RPM to 3500 RPM at highway speed. It only happens...