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International Automotive Technicians Network
Re: Reoccurring P0420
Posted to Technical Discussion Forum on 9/5/2019 1 Reply

Check out these bulletins for CAT related ECM re-flashes. See if any apply to your vehicle. You can call your local Subaru dealer service dept give them the VIN and see if your car is eligible for or if they've been done.

WQD-40

WVM-23R

WVU-31R

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