Question about Toyota Cars & Trucks
Most of the time the catalytic converter is bad an needs to be replaced . Have you had any misfire's ?
Posted on Apr 20, 2017
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Posted on Jan 02, 2017
SOURCE: Toyota Camry 2004 P0420
well that's if I'm not mistaken, catalyst system efficiency THRESHOLD!!! it is "bank" when your description code explanes bank 1 that is a O 2 sensor anything says BANK is a Oxygen sensor = O 2 sensor.what is it doing shutting off when eng warms up or sputtering or nothing really out of normal behavior? these switches will loose all communication with computer or get stuck in 1 of three ranges each range behave differently! in each range the deal with these are these switches are a part of maintenance usa @ hundred thousand km they should be change for emission efficiency and fuel consumption and vehicle performance usually after 1 is changed 9 times out of 10 shortly after the next bank will produce eng light and so on!! I usually change both while I'm at it you know pay me now or pay me again later but twice as much! well hope this helps you out good luck cheers happy new year.John, Toronto,Ontario
Posted on Jan 03, 2009
That's a pretty RELIABLE code!... You have a bad CAT (Catalytic Converter). Trust it to be accurate. The conditions which set this code is when the Upstream O2 sensor's data/signal is compared to the Downstream sensor's data/signal... when they are nearly identical, that's when this code is set (unless you have an exhaust leak).. If there is an exhaust leak.. repair it, then retest/recheck.
Posted on May 31, 2009
have you tried to replace the 02 sensors, make sure to use penetrating lubricant when removing them, you may need to apply heat as well to get them to come out without stripping out.
Posted on Jul 13, 2009
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