OBD code P0172, Forester 2002

Got the CEL with a P0172 code a week ago. "Fuel trim malfunction (A/F too rich)". Cleared and so far it hasn't come back. At this point, what is better:

  1. Not bother with anything until it comes back again?
  2. Start checking and investigating?

There doesn't seem to be anything wrong with the car. Maybe, just maybe, a little rough idling thouhg. Is it, by any chance, a common code that tends to be triggered by one particular component on Subarus?

DK

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DK
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Hi, Checked air filter? Until it becomes solid not much can be done.

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Tony Hwang

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