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.

P0420 toyota 4runner

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. I can afford a oxygen sensor. How can I find out??? Sort by Oldest first Oldest first Newest first Most reactions. I think the p is usually the rear O2 sensor but could be either one. If they haven't been changed in a while you might as well do both. Be sure to get Denso sensors, not Bosch. Best prices around.

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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.

Remember Me? Site Navigation. Member's Picture Albums. Check Engine Light intermittently comes on and off, for almost a year. Done the following: 1. Replaced Bank 1 Exhaust Catalytic converter manifold. Ran cataclean in fuel system.

P0420 toyota 4runner

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. Oxygen sensors measure these pollutants. When the readings from the upstream and downstream oxygen sensors show similar readings not enough pollutants expelled from the exhaust , your vehicle will throw the service engine soon light P This can happen for three reasons:. You can ignore this section if your 4Runner has an inline engine or if the exhaust manifolds merge into one pipe before the catalytic converter. Typically, the first cylinder is closer to the front of the engine. The bank 2 version of this code is P

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This is an older thread, you may not receive a response, and could be reviving an old thread. Recommended Communities. BB code is On. For a better experience, please enable JavaScript in your browser before proceeding. It appears I have a poor functioning Cat. I replaced the rear O2 sensor and reassembled the exhaust. P is a CAT problem,when you have misfire codes P is multiple misfire,P is cylinder 1 and so on. P Catalyst Code Bank1? Posting Rules. AZBub Senior Member. Then move on from there. Toyota - 4Runner. Sadly they are back on now though. Join us now! I have heard the rear sensor frequently goes out and it doesn't really do anything anyway except check the cat.

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Got it replaced for free Posting Rules. Thread Tools. It is always great to hear success stories. Find More Posts by mattbrook My suggestion to anyone with this error is start by replacing the PCV valve first. Originally Posted by Robb P is a code for the Bank 1 Catalytic Converter output. Find More Posts by vtferret. It doesn't seem to affect anything like mileage etc. Needs converter. Username or email address: Do you already have an account? Toyota - 4Runner. Reason: forgot to mention the last part. Factory cats are very expensive they are the best but you can get an aftermarket one for much cheaper.