Subaru 2014 Forester

Asked by Guru9R61S5 Aug 15, 2022 at 07:27 PM about the 2014 Subaru Forester

Question type: Maintenance & Repair

Code po420

3 Answers
310,255

Gene answered 2 years ago

Common code, the catch is find what is causing it. Faulty Three-way Catalyst Converter Bank 1 Exhaust Tube Intake Air Leaks Faulty Oxygen (O2) Sensor Faulty Fuel injector(s) Leaking Fuel Injector (s) Faulty Spark plugs Improper Ignition Timing Faulty Engine Control Module (ECM) Dirty Air Filter

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157,615

James answered 2 years ago

If it turns out to be the catalytic converter make sure they read the emissions decal under the hood so you get the correct new converter. Also make sure the engine didn't kill the old converter. Burning oil, internal coolant leaks, and misfiring are common causes for catalytic converter failures. Hope that helps! Jim

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