I got a 2007 Impreza for a cheap price, engine and transmission feels very good BUT it had a check engine light on.
I cleard with an OBD2 scanner and an app.
and the car drove fine for about 45 miles, excellent gas mileage and all good.
But ant the end of the day, just when stop at home, the check engine came back.
The codes where
P137 and P0457
I cleared it and drove fine but for 20 miles, then the CEL came back, but with the following codes
The car has removed the original airbox filter REMOVED and instead has a .... , I don know the name of those K&N filter that people use to "tune" cars
Fuel filler cap is good (it makes air coming sound when loosening)
Here are some number when driving WHEN THE CEL WAS OFF.
And HERE are the numbers AFTER the CEL came on.
Notice how the fuel mixture ratio is out of the parameter
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