P0420 toyota 4runner

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Remember Me? Site Navigation. Member's Picture Albums. I know there have been countless threads on this error code, but since I got my 4runner down to Florida it has been popping codes. I have had it cleared a few times, no big deal. Here's the strange part though. The other day I was playing around at one of the state parks, going a bit fast on the dirt roads with my 4wd on, and the strangest thing happened.

P0420 toyota 4runner

Log in. Sign up. JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding. I have had other error codes. Car: 4Runner V6 Took car to pep boys. They said bad catalytic converter. No error codes for miles. Then car ran funny. So I had a tune up and I had pep boys replace the spark plugs. That didn't fix it. Then they said it's bad o2 sensor. I had them Replace 1 out of 4 of those.

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Log in. Sign up. JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding. Getting code P bank 1 on Cali 4Runner Limited. Is it oxygen sensor or catelytic converter? The total vehicle value is almost the cost to replace the catelytic converter.

Remember Me? Site Navigation. Member's Picture Albums. Check Engine Light intermittently comes on and off, for almost a year. Done the following: 1.

P0420 toyota 4runner

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Originally Posted by Nelsonmd. The rear o2 sensor is probably 15 years old by the looks of it. Exhaust leaks are one. BroHon Replies. The time now is AM. I googled that and did a system reset of the yaw sensor which made the engine lights go off. So far I think I have it narrowed down to the injector. Thanks for all your input. Then car ran funny. Help fixing P So I had a tune up and I had pep boys replace the spark plugs. The o2 sensors have been replaced in the last 50K miles as well. All company, product, or service names references in this web site are used for identification purposes only and may be trademarks of their respective owners. Magnaflow from Oreilleys. The total vehicle value is almost the cost to replace the catelytic converter.

This page is meant to help you troubleshoot the Toyota 4Runner P trouble code. A failing oxygen sensor or bad catalytic converter are the most common causes of P Catalyst system efficiency is the percentage of these chemicals removed from the exhaust system.

Will you be able to use the tool and take real time readings for O2 sensors and anything else that the tool can show for the cats? I've had the code for over a year. Insert Quotes Quotes Post Reply. That information might trigger some more thoughts. Good luck. Welcome to 4Runners. For a better experience, please enable JavaScript in your browser before proceeding. Last edited: Jan 2, Well, it's been a week and the light came on--on my way to work. I take it that you have access to an OBD tool. Join Date: Aug Age: 33 Posts: 3. I think the p is usually the rear O2 sensor but could be either one. And then yaw sensor code pops up. I have had other error codes.