I've searched but couldn't find a possible answer. I had P0430 & the VSC TRAC lights on several months ago. I replaced the driver's side O2 sensor (before cat). The lights stayed off for those months until last week when the cel came on. I scanned & gave me the P0430 again. Should I replaced sensor 2? Thanks for all input.
P0430
- Thread starter fdte320
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I'm having a similar issue and the only thing that i've turned up is a failing cat. I went to custom muffler because my post cat failed a long time ago and I thought the codes were due to that but as per the tech at the shop, a P0430 is a precat failure and it would be extremely expensive to replace.
If you take it to custom muffler or something they can replace it but to answer your question. No, I haven't fixed the code. I think I might just do an entirely new exhaust from the headers.
ARK_SWAMP_RIDER
New member
Are you guys sure the P0430 is precat? I had that code on my old Mustang (no cats). The rear o2's were getting the same reading as the fronts, thus throwing the code. I found a very cheap and easy fix (for the light). If it's the same code as mine (my was the rear sensors), it'll work.
What is the cheap fix? I'll try it and see if it fixes it.
ggunn9
New member
I have the same issue and like you I could not find much on this site about it.
But I thought a P0430 was a post cat code.........Bank 2 Sensor 2. Meaning O2 sensor on drives side after the cat.
I ordered a new O2 sensor from ebay and should be getting it Monday. I am hoping that will fix my problem.
I heard an O2 sensor's life is about 100K I have 114k on my 4rnr.
ARK_SWAMP_RIDER
New member
The "fix" I speak of does nothing but get the engine light to turn off, it does nothing to actually "fix" the problem, just wanted to clarify that. Here's a link showing how. I believe the O2 sensors are all the same size, so the same non-fouler should work. I picked mine up at Advance Auto Parts, but most parts stores should have them.
ggunn9
New member
So I got my new O2 senor Monday and installed it that day. It was very easy. I got the senor socket from an auto parts store on loan although they charged me $27.00 up front. They will refund that.
I changed the senors and have driven nearly 50miles today and the CEL is gone no problems. I think that fixed my problem.
arty:
mdaaboul313
New member
any update on this ggunn9?
Eastcoastrunner
New member
So I got my new O2 senor Monday and installed it that day. It was very easy. I got the senor socket from an auto parts store on loan although they charged me $27.00 up front. They will refund that.
I changed the senors and have driven nearly 50miles today and the CEL is gone no problems. I think that fixed my problem.
oem sensor or denso/ngk? who makes best aftermarket, or the oem for that matter?
ggunn9
New member
I used an oem denso sensor. I got from ebay. Still no more C E light for me. Its my daily driver and I am getting better gas mileage.
ggunn9
New member
Not so fast my FRIEND
Well like Lee Corso says on College Football Game day---"Not so fast my Friend".
My CE like came back on last Thrusday. I had the local autoparts store run the code and it is back.
P0430.
I changed the Oxygen senor in bank 2. I don't know what to do now. Any advice???????????
Well like Lee Corso says on College Football Game day---"Not so fast my Friend".
My CE like came back on last Thrusday. I had the local autoparts store run the code and it is back.
P0430.
I changed the Oxygen senor in bank 2. I don't know what to do now. Any advice???????????
ice2000
New member
Well like Lee Corso says on College Football Game day---"Not so fast my Friend".
My CE like came back on last Thrusday. I had the local autoparts store run the code and it is back.
P0430.
I changed the Oxygen senor in bank 2. I don't know what to do now. Any advice???????????
Try unhooking the positive on the battery. That code came up on my sister's 4Runner also.
ggunn9
New member
I did that right after I put in the new sensor. But I will try to disconnect it again. thanks.
ggunn9
New member
Update!!! I looked at several other forums and found recommendations to simply replace my gas cap and disconnect the battery.
SUCCESS!!!
I did that on Monday and no CE light. Gas cap cost about $12 at the local autoparts store. The members the other forums stated the expected life of the gas cap is 5-7. My 4rnr is a 2004.
SUCCESS!!!
I did that on Monday and no CE light. Gas cap cost about $12 at the local autoparts store. The members the other forums stated the expected life of the gas cap is 5-7. My 4rnr is a 2004.
TrailRebel
New member
DTC P0430 CATALYST SYSTEM EFFICIENCY BELOW THRESHOLD (BANK 2)
I don't think replacing the gas cap is going to fix this code. Reason being, it will be a completely different code altogether (like a P0455 or P0456--Evap. emission control leak detected).
This code is getting set off because the PCM doesn't like what it's seeing from the oxygen sensors(which are the rear ones, the front ones are air/fuel sensors, just to detect lean/rich running conditions). So that means either the O2 sensor is bum, or the converters aren't doing their job.
My suggestion is if you don't have an actual scanner, to either replace the bank 2 rear O2 sensor and try it, or pay any reputable shop to scan it for you, so you can do the work at home.
My 06 had the same light on, but it was under 80k miles, so it was Federally Mandated Emission Warranty. I got three new catalytic converters out of it
I don't think replacing the gas cap is going to fix this code. Reason being, it will be a completely different code altogether (like a P0455 or P0456--Evap. emission control leak detected).
This code is getting set off because the PCM doesn't like what it's seeing from the oxygen sensors(which are the rear ones, the front ones are air/fuel sensors, just to detect lean/rich running conditions). So that means either the O2 sensor is bum, or the converters aren't doing their job.
My suggestion is if you don't have an actual scanner, to either replace the bank 2 rear O2 sensor and try it, or pay any reputable shop to scan it for you, so you can do the work at home.
My 06 had the same light on, but it was under 80k miles, so it was Federally Mandated Emission Warranty. I got three new catalytic converters out of it
BlackWorksInc
New member
As was stated before, you gas cap will not cause a P0430, it is a completely different monitor than your Catalyst Efficiency. I posted some helpful information in an older thread regarding catalytic converters and diagnosing codes such as these. Instead of taking the time to rewrite the post I am just going to go ahead and pull it for you and post it here.
~
Most if not all car manufacturers use the same testing parameters for catalytic converter efficiency, they will use a Pre-Cat O2 or AFR Sensor and a Post-Cat O2 sensor to measure the effective "oxygen storage" and from that it gives its result on what it thinks the catalytic converter's health is. That's it plain and simple, the ECU will look at Pre-Cat O2 levels and then Post-Cat O2 levels to determine if the catalytic converter is actually working. This presents a small plethora of possible problems and scenarios ranging from complete catalytic converter failure to biased O2 Sensors. The reality is that this is nothing more than a Go, No Go test, because the catalytic converter does not deal only in O2. The only proper and 100% accurate way to test a catalytic converter's efficiency is to preform an intrusive test, where you drill into the cat and use a 4 or 5 gas analyzer to verify functionality. But, most people don't want to drill into the cat and most customers don't like that idea either...
In any case, if one of these codes is tripped you should always assume an "innocent until proven guilty" frame of mind towards the problem. First test the O2 sensors individually and then compare to what the scantool is providing as information. After verifying that the sensors are working properly and that the scantool data is in-line with the sensors I would hook up a 4 or 5 gas analyzer to the exhaust and measure the gases. This won't give you a 100% accurate view of what is going on, but it will help you figure out what the catalytic converter is doing. Without going deeply into the operation and chemical reactions that occur inside of the catalytic converter, the gases will vary according to what is actually happening. For example, if your catalytic converter was working well there would be little Oxygen coming out the tailpipe because it is used in reaction to modify quantities of NOx, CO, CO2, and HC. Keep in mind also that the catalytic converter is NOT the problem, a catalytic converter should last the life of the vehicle or at the very least a whole hell of a lot longer than most people will keep the vehicle. If the vehicle is operating as it is supposed to your catalytic converter should not fail prematurely, this is a SYMPTOM of another problem, not a problem in it self. Something to keep in mind when dealing with these codes/repairs, because I have seen guys slap a set of sensors and cats on a car and have it come back with the same problem months down the line because the real problem trashed the cats again.
There are other things to consider, such as if the vehicle has been driven with faulty sensors for a long time sustained damage to the catalytic converter may have occurred and it will need to be replaced anyways. The sensors may have damaged the cat but it could be "brought back to life." I have seen catalytic converters be brought back to life before, but really its a 50/50 shot in the dark.
Here are some links:
HowStuffWorks "How Catalytic Converters Work"
http://www.converterwarehouse.com/te...rter-&News=100
Catalytic Converter Tech Tips : Catalytic Converter Replacement : ConverterWarehouse.com
All Catalytic Converters - How do I know if my catalytic converter is defective?
Hopeful this will help you out.
~
Most if not all car manufacturers use the same testing parameters for catalytic converter efficiency, they will use a Pre-Cat O2 or AFR Sensor and a Post-Cat O2 sensor to measure the effective "oxygen storage" and from that it gives its result on what it thinks the catalytic converter's health is. That's it plain and simple, the ECU will look at Pre-Cat O2 levels and then Post-Cat O2 levels to determine if the catalytic converter is actually working. This presents a small plethora of possible problems and scenarios ranging from complete catalytic converter failure to biased O2 Sensors. The reality is that this is nothing more than a Go, No Go test, because the catalytic converter does not deal only in O2. The only proper and 100% accurate way to test a catalytic converter's efficiency is to preform an intrusive test, where you drill into the cat and use a 4 or 5 gas analyzer to verify functionality. But, most people don't want to drill into the cat and most customers don't like that idea either...
In any case, if one of these codes is tripped you should always assume an "innocent until proven guilty" frame of mind towards the problem. First test the O2 sensors individually and then compare to what the scantool is providing as information. After verifying that the sensors are working properly and that the scantool data is in-line with the sensors I would hook up a 4 or 5 gas analyzer to the exhaust and measure the gases. This won't give you a 100% accurate view of what is going on, but it will help you figure out what the catalytic converter is doing. Without going deeply into the operation and chemical reactions that occur inside of the catalytic converter, the gases will vary according to what is actually happening. For example, if your catalytic converter was working well there would be little Oxygen coming out the tailpipe because it is used in reaction to modify quantities of NOx, CO, CO2, and HC. Keep in mind also that the catalytic converter is NOT the problem, a catalytic converter should last the life of the vehicle or at the very least a whole hell of a lot longer than most people will keep the vehicle. If the vehicle is operating as it is supposed to your catalytic converter should not fail prematurely, this is a SYMPTOM of another problem, not a problem in it self. Something to keep in mind when dealing with these codes/repairs, because I have seen guys slap a set of sensors and cats on a car and have it come back with the same problem months down the line because the real problem trashed the cats again.
There are other things to consider, such as if the vehicle has been driven with faulty sensors for a long time sustained damage to the catalytic converter may have occurred and it will need to be replaced anyways. The sensors may have damaged the cat but it could be "brought back to life." I have seen catalytic converters be brought back to life before, but really its a 50/50 shot in the dark.
Here are some links:
HowStuffWorks "How Catalytic Converters Work"
http://www.converterwarehouse.com/te...rter-&News=100
Catalytic Converter Tech Tips : Catalytic Converter Replacement : ConverterWarehouse.com
All Catalytic Converters - How do I know if my catalytic converter is defective?
Hopeful this will help you out.