I got P0420 & P0430 codes on my car. how do i fix them? do i need to change my o2 sensors? or is it the cats themselves? thanks.

 

im currently having a p0430 problem my self,
tuesday im gonna have my ecu properly reset...(not disconnecting the battery) already did that and the ses light popped back on,and if the light still comes on im gonna have to change my front precat. its about $428
price quote from dave b at southpoint nissan.

 

i'm currently in the process of getting a new 02 sensor. Since i have a y-pipe and both sensors are monitoring the same pre-cat, i know that its the sensor because i only have the P0430 code.

 

i just do not understand what is it exactly that "broke"? the cats? the sensors? or the whole damn engine...?

 

i have the same problem i keep hearing about the cat but i dont know which one people talk about the pre cat and the cat so which one is i dont know i just know is expensive.

 

If is the cat will replacing it with a high flow cat be a better option rather than the OEM because the OEM is expensive i was quoted like 600 just for the cat. I saw some high flow cats for like 200. something online.
So if anyone here knows let me know.

 

i had the p0420 code a few weeks back and autozone cleared it. It hasn't come back yet and it has been about 3 weeks and maybe 400 miles. I have a y-pipe also so it is not the pre-cats. If I do have to replace the cat, I will do the hi-flow aftermarket route that is much cheaper than OEM.

 

i just do not get why is it that before i changed my coils and MAF and had a short ram intake, i had NO CODES AT ALL!!!!????!!!???

 

Installing a Ypipe takes away the precat?

 

I have not done it myself but that is what I understand from reading the forums. Also from what I understand there is no issue with emissions (without the precats) as long as the car is at operating temperature.

You could read this thread for more info...

http://forums.maxima.org/showthread....=y-pipe+precat

 

I have a cat and a pre-cat. Anyone need one? one's name is schnookooms and the other's purrrsy.

Get the O2 sim, its only $30. This will fix all your kitty problems. works for fed-spec and Cali-spec, y-pipe or no y-pipe.
http://www.o2sim.com/

 

go to dealer, they will reprogram ECU or change pre-cat if needed. they are free within 8 years / 80K.

 

i have 81K on my car...

 

o2 sim from Cattman FTW!

 

P0420 code was reset by dealer with ECU update at 70,000

P0420 code returned at 135,000 miles, dealer wanter to replace catalytic converter, estimate $1100.00, I declined.

Replaced all 4 oxygen sensors with Bosch Universal type at 146,000 miles for $266.00.

P0420 code is gone
Passed inspection with emissions test in Mass.

 

damn ppl enough with all the damn just take it to the dealer **** dont yall think if we could we would alot of us are well past 80,000 already damn.

so to solve this (p-0430 problem)...02sim,ecu reset,new precat,or buy all 4 new 02 sensors???

 

well, O2 simulatior is BY FAR the cheapest way to go...

 

what is exactly a code for Oxygen sensors? if 500+ to replace the precut then f*** that O2 sim is a way to go

 

Replace the O2 sensors and reflash the ECU, stay away from the O2 simulators which essentially are stop gap setups. These setups will hurt you if you live in a state like CA where the emissions check with expose these arrangements!!! My $0.02 since I have done this before.

 

i used to get these codes quite often. i have a aftermarket y. let me tell you what fixed mine. everytime i got gas i make sure the cap is on correctly. havent gotten these codes in many months and havent replaced a thing!

 

02 simulator question:

Alright I have an 2000 maxima with 120k miles. The P0420 came on and the precat was replaced at 100k miles, so I know with a garage kept car there is no way this thing has broken down.

The www.02sim.com link has been on backorder for 3 months now.

Can someone link me to EXACTLY the o2 sims I need.
Regarding installation,
Do I cut all o2 simulators and put a sim on the end of each one?
Do I need the dual sims or the individual or will it matter?

Thank you!

 

Yep, just screw the O2 simulator into the O2 sensor socket and screw the O2 sensor into the simulator socket. Problem solved for $2 if you do it yourself.

 

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