Re: Subaru Forester question about CEL and code 2040. The scanner code P0420 also said catalytic converter efficency, Bank 1 if that helps

Terlin77
40

Asked by Dec 29, 2012 at 10:31 AM about the 2006 Subaru Forester

Question type: Maintenance & Repair

1 Answer

Tom Demyan
165,415

Don't just replace the sensor it can be other issues causing the sensor to detect a problem. Check this link out for possible solutions.....http://www.obd-codes.com/p0420

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