Question about Chevrolet Cavalier
I am trying to figure out if i need a new cat or 02 sensors, i have a p0420 code, i have done some research some people say 02 sensor others say cat
Trouble Code: P0420 Catalyst System Low Efficiency Possible Causes:
Air leaks at the exhaust manifold or in the exhaust pipesBase engine problems (i.e., high engine oil or coolant usage)Catalytic converter is damaged, contaminated or has failedContinuous engine misfire conditions, or weak or low coil outputFront HO2S or rear HO2S is contaminated with fuel or moistureRear HO2S is loose in the mounting hole (check it for a leak)Front HO2S older (aged) than the rear HO2S (HO2S-12 is lazy)
Catalyst System Low Efficiency
Posted on Dec 05, 2012
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Posted on Jan 02, 2017
the light can be caused by any one or combination of over 200 trouble codes, go to any kragen or Autozone parts store and ask for a trouble code test, it is free, then record the code(s) they come up with and post them back on fixya
Posted on Apr 19, 2009
PLEASE CLICK HERE to see a page dedicated to your Fault Code.
It is Cat. Convertor related.
this is a fault code for a bad drivers side catilist.this code will also set if there is a exhust leak as well on that side.The catilist is covered under warranty for 8 years or 80k
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Posted on Apr 08, 2009
from what i am finding the code means o2 sensors. they recommend replacing them and if this does not work than replacing the cat converter
The catalytic converter has an oxygen sensor in front and behind it. When the vehicle is warm and running in closed loop mode, the upstream oxygen sensor waveform reading should fluctuate. The downstream O2 sensor reading should be fairly steady. Typically the P0420 code triggers the Check Engine Light if the readings of the two sensors are similar. This is indicative of (among other things) a converter that is not working as efficiently as it should be (according to specs). It is part of the vehicle emissions system.
A code P0420 may mean that one or more of the following has happened:
Some suggested steps for troubleshooting a P0420 code include:
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Posted on Aug 20, 2009
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P0430....Catalyst System Efficiency Below Threshold (Bank 2)try changing the O2 sensors the one before the cat is the first one to fail in normal circumstances ,must be an american market model this vehicle as i cannot read a europeon market vehcle here in europe ,encrypted software
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