2000 Tundra Check Engine Light Code P0420

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Thread: 2000 Tundra Check Engine Light Code P0420

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    Exclamation 2000 Tundra Check Engine Light Code P0420

    Alrite I have a 2000 Tundra with 110,000 miles. Just recently the check engine light came on. When it came on I noticed that at a stop light the truck would idle below normal. It wouldn't always happen though. I am getting a worse gas mileage. The light would come on for a week then turn off for a few days then come back on. I put dual flowmaster 40 series on about a year ago. The scan tool says anything from air leak in exhaust before rear h02s, af sensor error, fuel system fault, or faulty cat. Anyone have any idaes what it may be. Thanks

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    SAS'ed #5 dyogim's Avatar
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    Default Re: 2000 Tundra Check Engine Light Code P0420

    Do a search and you'll see what others have diagnosed. Here's one for example: http://www.tundrasolutions.com/forum...le-code-po420/

    Off the top, it could be O2 sensors or a catalytic converter.

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    Junior Member streetracin101's Avatar
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    Default Re: 2000 Tundra Check Engine Light Code P0420

    1) Do you hear any rattles in the exhaust?

    2) Do you notice any smells when the exhaust is hot?

    3) Have you noticed a loss in power?

    My first thought is a clogged cat. If you have access to am infrared thermometer (its like a laser pointer that will read surface temps) measure the temp on the exhaust pipe just before the cat converter, and then read the temp on the exhaust pipe just after. If there is a significant difference in temp, its clogged. You could also pull the cat and visually inspect it for holes in the honey comb, or clumps that fall out.

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    Veteran Member 5 Speed's Avatar
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    Default Re: 2000 Tundra Check Engine Light Code P0420

    My first guess is old/going bad O2 sensor after the cat. That was what caused mine but I have a V6 tundra. Mine did the on and off before it finally wouldn't reset with my scangauge

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    Veteran Member oofy15354's Avatar
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    Default Re: 2000 Tundra Check Engine Light Code P0420

    My tacoma was just throwing this code. it was the cat and it was replaced under the federal 8 year 80,000 mile emissions warranty (O2 sensors are only covered for 2 years, 20k) but you seem to be over that warranty. That would have been a $1,500 charge if performed at a dealership and not under warranty. I just had this work done last week so I can't say for sure if it was fixed but they ran tests that showed the cat was underperforming
    2001 Black AC V8 4x4

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    Default Re: 2000 Tundra Check Engine Light Code P0420

    Quote Originally Posted by streetracin101 View Post
    1) Do you hear any rattles in the exhaust?

    2) Do you notice any smells when the exhaust is hot?

    3) Have you noticed a loss in power?

    My first thought is a clogged cat. If you have access to am infrared thermometer (its like a laser pointer that will read surface temps) measure the temp on the exhaust pipe just before the cat converter, and then read the temp on the exhaust pipe just after. If there is a significant difference in temp, its clogged. You could also pull the cat and visually inspect it for holes in the honey comb, or clumps that fall out.
    I dont here any rattles or smells but I do feel like i lost a little power.

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