I AM HOPING IF ANYBODY COULD TELL ME MORE INFO ABOUT THIS CODE: P0420 BANK 1 CATALYST EFFICIENCY BELOW THRESHOLD. I LOOKED UP FOR SOME INFO BUT CANT REALLY FIND THE EXACT SOLUTION. HOPEFULLY SOMEONE COULD HELP. THANKS.

 

ANYBODY????

 

what car and motor? how many miles? hows the motor run?

 

CIVIC 99. STOCK MOTOR...D16. 93K MILES. MOTOR RUNS GOOD. CHECK ENGINE LIGHT TURNS ON BUT THEN IT TURNS OFF.


Modified by JDMPHILEP91 at 1:10 PM 7/13/2008

 

anybody????
any info???tips??? something???

 

if you have a good scanner and can watch data on it. moniter the front and rear o2 sensers. if the rear mimics the front your catalytic converter is bad. you could start cheap first with a 3 part top engine cleaner if you dont have a scanner. if that dont work then you will need a converter.

 

well it cant be my converter. because i just bought a brand new one. ill tell my homie to use the scanner at his shop. thanx for the help.

 

or go to autozone and rent it for freeeeee.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by K i l l a B e e. &raquo;</TD></TR><TR><TD CLASS="quote">or go to autozone and rent it for freeeeee.</TD></TR></TABLE>

the obd2 scanners from auto zone dont have a lot of futures.

 

PO420 is the catalitic converter not burning the gases like it is suppose to. If you have already installed a new converter it could be the O2 sensor it self or a mechanical issue. Make sure you don't have any vacumm leaks and your fuel pressure is right. Also make sure the front O2 sensor is switching like it needs to.

 

well hopefully is not the catalytic converter. which i doubt it will be. if it will be the 02 sensor then in the scanner it will appear 02 sensor. so i doubt that too. i dont have no vaccumm leaks and fuel pressure is ok. thanks for the help though.

 

What kind of converter did you install OEM, After market bolt in, or a weld in?

 

aftermarket. and is a bolt in.

 

I'm goin to say that you have a lazy O2 sensor behind the convertor if no exhaust leaks.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JDMPHILEP91 &raquo;</TD></TR><TR><TD CLASS="quote">well hopefully is not the catalytic converter. which i doubt it will be. if it will be the 02 sensor then in the scanner it will appear 02 sensor. so i doubt that too. i dont have no vaccumm leaks and fuel pressure is ok. thanks for the help though.</TD></TR></TABLE>

I think it's the cat. if it's not a cat, its gonna be the o2 sensor.

 

if you can t get a scanner get a multimeter and ur voltage on your front o2 sensor should run between .1 -.9 mV and then check the rear o2 sensor it should stay at a constant voltage if it toggles like the first one your cat is not clearing up the gasses like it should and it is bad whether it is new or not

 

alright. thanks guys. i havent had time to check it out. but hopefully its the o2 senor...which i doubt.
what would be the causes of why the cat is not burnin up the gasses?

 

From the schools I've gone to say that your converter should last the life of the car as long you keep up the maintance. What causes them (O2) to bad is the heat of the exhaust. In the maintance manuals they are supposed to be changed at 50k intervals. Over time they will have a build up on them slowing there abillity of reading the gasses. There mostly at fault due to dirty air filters or free flow(K&N) type, fuel filter restriction, and oil consumption. No body ever changes them till they have problems. At my shop when a converter does show defective it also gets O2 sensors and fuel filter.

 

yea i know that cats are suppose to last the life of the car.
u might of just given me the answer. i have a dirty filter right now...i have to buy another one...i noticed that last week...but i havent had time to change it....so that might be it.


Modified by JDMPHILEP91 at 9:56 PM 7/15/2008