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03 Wagon fuel (exhaust?) smell in cabin- p0171 & p0420. Rough idle and hesitation.

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03 Wagon fuel (exhaust?) smell in cabin- p0171 & p0420. Rough idle and hesitation.

Took the car in to dealer (non subaru) and they replaced O2 sensor. Light was off for about 2 days and came back on. Went to two separate autozones and both showed no code, despite the CEL being on. The car will sometimes rough idle, not all the time. Sometimes it will hesitate at around 3200rpm, sometimes it wont. It's been cold here, around 15 degrees F. Stock car. Putting 93 octane in. Could that be a problem?

The car was just purchased a couple weeks ago. Can't tell if the car has ever been tuned. The turbo heat shield is missing, however the turbo was replaced so perhaps it wasn't put back on? Car has 68k on it.

Car was taken in around '09 for fuel TPB according to mysubaru.com

Other than that the car usually runs and drives perfectly.

Any thoughts or ideas would be greatly appreciated! First Subaru!
 
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