Question about 2002 Toyota Camry

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0420 code2002 tyota camary 2400 cc engine eficency below threshhold

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Double check for leaks and cracks in your exhaust system. Those need to be addressed first. If nothing found,1 of 3 thrings is quite likely; 1. bad front o2 sensor 2. bad rear o2 sensor or 3. failing catalytic converter. One way to check the cat is to run at normal operating temp around the block a few times, return to your work area, hose the cat down with a water hose and wait for the light to turn on. If it does, have a new cat welded in place. It is a good idea to replace the o2 sensors at the cat( fore and aft) to avoid more repairs. Not necessary though.

Posted on Aug 22, 2010

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Posted on Jan 02, 2017

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Po 300 Po 316 Po420 Po430 2004 Ford Taurus. The car idle high or ruff when I start it in the morning but never shut off. After I got tune up it's worse it even shut off after running for a few mins


code p 0300 refers to random /multiple cylinder/s ---misfire detected ===causes spark plug/s---HT lead/s ---injector/s --ignition coil/s ---low compression---wiring
code p 0316 refers to misfire detected during start up--first 1000 revolutions ===causes --engine mechanical fault ---wiring---ignition system---fuel system--injector/s
code p 0420 refers to cat converter system, bank 1---efficiency below threshold === causes cat converter---HO2S 2
code p 430 refers to the same problem and causes as code p 0420
Here is a news flash .
engines under the control of an engine control module (ECM) do not need you to do a tune up as it tunes the engine 60 times a minute and reports to you by fault codes when it can no longer tune up the engine

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What should i do if i get a 0420 code on a 2003 ford taurus


Trouble code P0420 means: Catalyst System Efficiency Below Threshold

This is unrelated to the noise when turning sharply or the grinding when braking/brake light.

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1 Answer

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Catyalist below threshhold,means most likely the cat,is stopping up.

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Engine light came on code #p0422 main catylist below threshhold bank one?


Common Problems That Trigger the P0422 Code
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Catalyst system efficiency below threshhold bank 2


before replacing cat converter replace o2 sensors, they go bad and give a false reading that cat efficiency is below threshold ,meaning converter is no good , i would replace o2 sensors and reset engine light and go from there,the o2 s are normaly the problem, unless you hear cat rattling, well good luck,

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look on the intake it should be there

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Check Engine Light


Hello engelhard58
I have attached a link that can give you some of the reasons why your getting that code.I hope you able to get your answer out of that.
Mean of the code=P0420 Catalyst System Efficiency Below Threshold.
Link to site

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