Need Help Diagnostics on P0430 O2 Catalyst
08-01-2019, 05:11 PM
#1
Rennlist Member
Thread Starter
Need Help Diagnostics on P0430 O2 Catalyst
getting a repeatable CEL code P0430 for Catalyst System Efficiency below threshold on Bank 2. I've cleared the code a couple times & it keeps coming back.
So off the top of my head I'm thinking its either that Cat,.. or maybe the O2 sensor itself.
So off the top of my head I'm thinking its either that Cat,.. or maybe the O2 sensor itself.
Last edited by bweSteve; 07-19-2021 at 01:52 PM.
08-01-2019, 10:56 PM
#2
Rennlist Member
An easy fix is to use a non-fouler on the post o2 sensor.
https://www.fvd.net/us-en/FVD111LAMV...ividually.html
You can probably pickup one at a local auto part store for $5.
The other option would be to install a new o2 sensor, then you will know if it is the sensor or a failed cat (unlikely)
You can have the oem o2 shipped from rockauto:
https://www.rockauto.com/en/catalog/...2)+sensor,5132
https://www.rockauto.com/en/moreinfo...1445370&jsn=19
https://www.fvd.net/us-en/FVD111LAMV...ividually.html
You can probably pickup one at a local auto part store for $5.
The other option would be to install a new o2 sensor, then you will know if it is the sensor or a failed cat (unlikely)
You can have the oem o2 shipped from rockauto:
https://www.rockauto.com/en/catalog/...2)+sensor,5132
https://www.rockauto.com/en/moreinfo...1445370&jsn=19
08-01-2019, 11:07 PM
#4
Rennlist Member
I get the same code intermittently. My exhaust is stock.
Few times it popped up I think it was after non spirited driving, but really hot days.
Few times it popped up I think it was after non spirited driving, but really hot days.
08-01-2019, 11:27 PM
#5
Rennlist Member
Thx. I've seen em as some of my friends have had an extension tube welded in.
Question on that type of screw in extension - when it is the cars computer, which is interpreting the level of O2 being observed at the sensor, and deciding whether it is within the threshold range,... how does holding the O2 sensor slightly further away from the exhaust gases help the situation? I can understand that physically it reduces the emissions that the O2 sensor is seeing,... but doesn't that just swing the "level" back the other way? Like leaning it out?
Maybe another way to ask the question is whether it is always a "rich" situation at the O2 sensor when a threshold is exceeded (& CEL is tripped),... thus installing a extension pulls it back (leaning it out) so that the computer thinks its back "in range"?
and is it safe to assume that by running my car constantly with the valves open, and through a SW bypass,.. that the gases are flowing more freely, and thus somehow back closer to the headers the O2 sensor is somehow reading a rich situation? ... that almost doesn't make sense as I type it, given my car has been running for 3,000 miles fine setup this way beforehand. And even the temperatures outside this morning were nice. Not too hot out.
Description from FVD: "Our adapter offsets the oxygen sensor about 1.5 inch from the gas stream. This achieves, in most cases, a sufficient measurement for the air/CO ratio and increases the tolerance range between the pre and post cat oxygen sensors. In addition, the sensitivity of the oxygen sensor is also reduced allowing you to run a nearly any exhaust or catalytic set up, including bypass pipes, without the need to reprogram your ECU."
Thanks in advance,
=Steve
Question on that type of screw in extension - when it is the cars computer, which is interpreting the level of O2 being observed at the sensor, and deciding whether it is within the threshold range,... how does holding the O2 sensor slightly further away from the exhaust gases help the situation? I can understand that physically it reduces the emissions that the O2 sensor is seeing,... but doesn't that just swing the "level" back the other way? Like leaning it out?
Maybe another way to ask the question is whether it is always a "rich" situation at the O2 sensor when a threshold is exceeded (& CEL is tripped),... thus installing a extension pulls it back (leaning it out) so that the computer thinks its back "in range"?
and is it safe to assume that by running my car constantly with the valves open, and through a SW bypass,.. that the gases are flowing more freely, and thus somehow back closer to the headers the O2 sensor is somehow reading a rich situation? ... that almost doesn't make sense as I type it, given my car has been running for 3,000 miles fine setup this way beforehand. And even the temperatures outside this morning were nice. Not too hot out.
Description from FVD: "Our adapter offsets the oxygen sensor about 1.5 inch from the gas stream. This achieves, in most cases, a sufficient measurement for the air/CO ratio and increases the tolerance range between the pre and post cat oxygen sensors. In addition, the sensitivity of the oxygen sensor is also reduced allowing you to run a nearly any exhaust or catalytic set up, including bypass pipes, without the need to reprogram your ECU."
Thanks in advance,
=Steve
Description from FVD: "Our adapter offsets the oxygen sensor about 1.5 inch from the gas stream. This achieves, in most cases, a sufficient measurement for the air/CO ratio and increases the tolerance range between the pre and post cat oxygen sensors. In addition, the sensitivity of the oxygen sensor is also reduced allowing you to run a nearly any exhaust or catalytic set up, including bypass pipes, without the need to reprogram your ECU."
08-02-2019, 11:36 AM
#9
Rennlist Member
08-02-2019, 12:50 PM
#10
i have a 2010 and in the last 3 years i had a p0420 (cat replaced under CPO warranty) and p0430 (cat replaced out of pocket).
take the opportunity to get new O2 sensors all around also. these cars are old now my friend. a decade of heat cycles and stiff suspension and 8000 RPM shifts will kill cats.
if you live in a free state unlike me just get some race cats or straight pipe it.
take the opportunity to get new O2 sensors all around also. these cars are old now my friend. a decade of heat cycles and stiff suspension and 8000 RPM shifts will kill cats.
if you live in a free state unlike me just get some race cats or straight pipe it.
08-02-2019, 03:07 PM
#11
Rennlist Member
Take a look at the cats I just posted to see what happens when they are used properly :-)
01-24-2021, 03:43 PM
#12
Rennlist Member
Mine was a cracked cat. Dealer Replaced manifold and cat under warranty.
01-25-2021, 10:44 AM
#14
Rennlist Member
I've had the Carnewel remote setup for many years. The ground/negative has to be solid or a bad contact can make it malfunction. Other than that, I've had FVD center bypass and more recently the Soul valved side bypass, so no mufflers 
. No cat issues all this time. So what was the outcome/diagnosis in Steve's case?
I've never had an O2 issue, but I imagine the first step would be cleaning the sensor and electrical connector/plug.
I'll do a search out of curiosity-
. No cat issues all this time. So what was the outcome/diagnosis in Steve's case?I've never had an O2 issue, but I imagine the first step would be cleaning the sensor and electrical connector/plug.
I'll do a search out of curiosity-