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2000 Toyota Sienna catalytic converter code

I have a 2000 toyota sienna that’s throwing a catalytic converter code and need to know if theese symptoms are caused by the clogged converter? Slow rough idle
2- transmission shifts very slowly?
3- engine wants to nearly die?
4- electrical power drain causing significant slower power windows and power sliding door to barley work as well as dim headlights even though new battery and alternator are installed?
Water/coolant pressure backing up causing water to blow all over engine compartment?

Slow rough idle - Yes
2) Probably not
3) Yes
4) No
Coolant overflowing the engine compartment - Yes

This Sienna likely has lots of problems beyond the cat. Any other codes besides the cat code? And which cat code does it show?

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3 things can cause a catalytic converter to clog

1)If your engine is burning oil, the catalytic converter will eventually clog.You need to fix the oil burning problem first before doing anything else.
Over time, many engines begin to consume oil. This happens because of piston rings that lose their ability to properly seal as the miles pile up, or because a valve becomes stuck. It can also be due to any number of small design issues or worn-out engine components. The oil that’s burned in the engine ends up flowing through the exhaust system, where it can eventually cause catalytic converter failure in much the same way as a coolant leak. Black smoke or signs that your car is using a significant amount of oil in between changes are indicators that you may end up reducing the efficiency of — or even permanently damaging — your converter.

Replacing a converter can be a nuisance, but it’s definitely worth it when you consider the reduced power and increased fuel consumption that it can cause when it starts to malfunction.

  1. Unburned Fuel
    Catalytic converter cross-sectionHeat can be damaging to almost any engine component, so it’s no surprise that it’s one of the most common causes of catalytic converter failure. Engine exhaust is already quite hot, so when you add in a contaminant like unburned fuel, which can find its way into the exhaust system when your motor is running too rich, you compound the effect, as that fuel typically ends up burning inside the converter itself. This can damage or even melt the honeycomb structure that is required for the catalyst metals to do their job, leading to a blockage and restriction in exhaust flow. If your engine is misfiring or if you see a warning code for a bad oxygen sensor, it’s a good idea to take care of the problem before it can lead to catalytic converter failure.

  2. Coolant Leaks
    Coolant leaking into your engine’s combustion chamber is a serious problem that can eventually do significant damage to your motor. A slow leak, however — say, from a bad head gasket — can also send enough coolant back through the exhaust system over time to clog your catalytic converter and contaminate the materials used inside of it until they are no longer effective. If you notice coolant disappearing from your engine’s reservoir or see white smoke in your exhaust, then that’s a sign of a bad head gasket, which should be corrected immediately.

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