Question about 2003 Toyota Corolla
I have Toyota Camry Special edition 2004. I am getting check engine light "on". After computer check I found the code P0420. It also provide little description about the code that Catalyst System Efficiency below threshold.
I need to know what to do now. Thanks in advance for the help.
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
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Posted on Jan 02, 2017
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