Question about 1998 Honda Accord
P0420 DTC low bank 1, cel on. just bought 3wks ago. really cant afford catalytic converter. Slight jerking at acceleration and deceleration unsure of what that means.
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Posted on Jan 02, 2017
misfiring can cause a P0420 code.
I would recommend a set of honda plug wires and plugs if the P0420 code returns.
I have used bolt in aftermarket bolt in catalytic converters but don't remember the brand name they fit ok and i have had 1 or 2 return with a P0420 code out of about 20. I have never replaced the oxygen sensor on a civic like yours.
I always fix the misfire problems, reset the computer, and have the customer drive it and see if the code p0420 returns. 50% don't have the P420 code return. drive it and see what happens and go from there.
Posted on Jan 06, 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
P0420 indicates the computer thinks the catalytic converter isn't working as well as it should. This is determined by the PCM evaluating the switch rate of the front and rear o2 sensors. Once the rear o2 sensor switch rate reaches a point close to the front o2 sensor it sets the code. This can be a result of degenerated catalytic converter, or in some rare instances, bad o2 sensors. In most cases repairing this condition requires replacing the catalytic converter with an OEM unit. Aftermarket converters don't have the same quality and quantity of the precious metals that make up the substrate found inside. This usually results in the code setting again in just a few months.
Posted on Oct 04, 2010
The code po420 is the cat efficencey which means the cat is bad but it could be a bad sensor, you will need to have the o2 sensors checked to see but lots of techs say a good tech should know if an o2 is bad but i will tell you i have had some that test good and end up being bad. they tested good at the time i checked them, a good rule that i follow any car with over 80,000 miles on it with a bad converter gets new o2 sensors, this is to help customer and us from comebacks, a weak or slow o2 will destroy the new converter, it may test good at the time of the new converter but then a few months down the road it gets lazy and after a while some ones not going to be happy having to buy another converter after just doing one a few months ago or even a year ago, seen it ,done it, many times,if i were you i would replace the o2 sensors and reset the light and go from there , if light stays out good if not replace the converter, all you are doing is doing it in two steps and you may get lucky and not have to replace the converter good luck.
Posted on Mar 19, 2011
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