Question about Cars & Trucks
Posted by Anonymous on
This code indicates your catalytic converter has worn out. Check the numbers from the emission test to verify you exceeded hydrocarbon limits. If yes, replace the converter. Not sure why the light is not coming on. Could be a bad connection between the computer and the instrument panel.You would have to troubleshoot the computer connector to find the problem.
Posted on May 18, 2017
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Posted on Jan 02, 2017
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
I would send the car for a smoke test for the emissions leak...Find out where the leak is comming from..Repair it..Reset the codes, then do a drive cycle and see what happens...
Posted on Feb 19, 2010
P0401 indicates that the Exhaust Gas Recirculation Flow Insufficient Detected. This can be because EGR is faulty . As you have replaced this then the problem must be with the vacuum line . EGR valve vacuum line which can be broken or blocked. The vacumn ine must bbe checked for leaks or any blocks using an vacumn pump connected the line.
P0420 indicates that the down stream oxygen sensor reading is not steady and it is connected with the code P0401.
Posted on Jan 05, 2011
Hello: Code 420 normally indicates a catalytic converter is operating below 60% efficiency. You need to take your car to another shop and request a COMPLETE diagnosis not a dart board guess.
Posted on Sep 13, 2011
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When the Check Engine light is turned on the computer control unit (called the PCM) has sensed a fault in the electronic controls of the engine and/or the emission system. When this happens you will seldom feel the car engine run any different. There are about 200 possible faults that turn the Check Engine light on, to know what has developed a problem you must have the system tested, this is called an OBD2 fault code test, Kragen and Autozone parts stores do this testing for free.
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