P0420 toyota 4runner

Remember Me? Site Navigation. Hello again got a new problem yaaaa!!! I think i going to try some new wires and see what that gets me if not maybe try switching the coil packs around, 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.

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.

Quick Links: A code scanner? Find More Posts by jimlaw3. Then it was maybe dirty throttle body.

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.

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.

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Please consider creating a new thread. I only know as much as I've experienced and the two times I've replaced cats on a car was when there was a smell of rotten eggs or a rattle and with the rattle--sometimes chunks of the innards would clog up the pipe and cause drastic power loss. Lights been off for almost a week. Mark Forums Read. Read online it's a dirty MAF. Since both cats have previously been replaced, I don't understand why they would have gone bad again! Stay tuned. I dont really know what to try next. Find More Posts by toto. Mine comes on between after reset and a couple thousand miles. Hope that helps a little bit. I can see that the front o2 sensor voltage is fairly stable around 3.

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I took it to the shop. I googled that and did a system reset of the yaw sensor which made the engine lights go off. Sometimes it takes months. It might just mean you are on the edge. Sign up. Explore Our Forums. The time now is AM. Did another search and read that bad PCV valve can cause p Remember Me? I have read many threads on this Code but can determine which Cat is bad.