2000 Toyota Tundra Code P0420 at Breaking News

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2000 Toyota Tundra Code P0420, I've never replaced a cat with a new aftermarket cat (even the cheap ones) and had it fail to scrub the exhaust enough that it sets the p0420 code again. Basically, this code means that something in the evap system is broken. Leaded fuel in an unleaded system will nearly always trigger this, given the differing properties of leaded fuel combustion and exhaust.

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Po155 toyota from automotorpad.com

Again i could be wrong but that is what i am told! 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. Loose fuel tank filler cap is the most common cause that triggers the p0440 code.

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Loose or bad gas cap Faulty fuel injector (s) leaking fuel injector (s) faulty spark plugs. The p0440 code means that the control module has detected a leak in the evaporative emission (evap). It often appears with other codes, such as p0420, p0441, or p0440. Be sure you don't have any exhaust leaks between the engine and the cat as they can actually allow the exhaust to suck air in and skew o2 readings.