Diagnostic Method 1: Notes

WARNING: This page is about a different car, the 2012 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.

Detect the malfunction depending on the average value of time necessary for λ to inverse the air fuel ratio from "Lean → Rich → Lean" to "Rich → Lean → Rich".

Fig 1: Air Fuel Ratio From "Lean → Rich → Lean" To "Rich → Lean → Rich" Graph

Courtesy of SUBARU OF AMERICA, INC.