The most common reason for check engine code P0420 is catalytic converter failure, but there are other potential causes for this code. YearĮxhaust Manifold/Catalytic Converter w/P0430 The chart below shows the most likely repair and cost range for 4Runners for all of the years that FIXD has data on. Most Likely Repair And Cost For Toyota 4Runner P0420 By Year Code P0420 indicates that the catalytic converter is not functioning efficiently, therefore increasing the output of harmful pollutants by the vehicle. The function of the catalytic converter is to break down harmful pollutants that are created by your Toyota 4Runner during the combustion cycle and convert them into less harmful gases. You can take your car into a shop, or click here to save money by fixing P0420 yourself with FIXD! There are many variables that could cause this code. Diagnosis: The most common cause of Toyota 4Runner P0420 is a bad catalytic converter, but it can be caused by anything from a faulty oxygen sensor to a rich or lean running condition, or misfires.Repair Urgency: Get this code fixed as soon as possible to avoid further damage to your emission system and possible engine damage.Issue Severity: MODERATE – Extended driving with this code can cause internal engine damage.Toyota 4Runner P0420 definition: Catalyst system efficiency below threshold (Bank 1). What Does Toyota 4Runner Code P0420 Mean?
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