P0430

[Sporin]

DTC P0430 CATALYST SYSTEM EFFICIENCY BELOW THRESHOLD (BANK 2)

Well, nearly a year and about 6000 miles since my last post and the CEL frequency has really increased. I'm to the point in the last month or so where it comes on almost every time I drive the truck.

I actually just had it into my exhaust shop to get my rusty tailpipe replaced today. I had hoped that might help the issue, but I've popped it 3 times in my travels today post-exhaust work.

He didn't find any other leaks but I haven't done the blower test on it yet (we are deep into sub-zero winter here)

I think I just may go with the defouler (though I'm sure it's all rusted to heck under there) and see if that works. We have yearly inspections here but it's safety related, they do plug in the OBDII reader and make sure there are no codes though. I doubt anyone would notice a defouler.

I'm experiencing no power or MPG loss.

I'm using a wifi code reader and an app on my phone to read and clear the code. I suspect it is worth doing a full decharge by undoing the battery for a while to truly, deeply, reset everything.

 

[lightfreak]

Here's what I put in my V6

DENSO 2344804 Downstream Left
DENSO 2344805 Downstream Right

These were like $100 for both from Rockauto
Denso is the OE supplier and side by side comparison they looked exactly the same as the originals; harness length, connector, hole count, etc.


I was only getting the P0420 code periodically the last couple months, changed both downstreams anyway and left the upstreams alone. So far so good in over 600 km

:uzi:

Adding an update to this after 1 year and 25,000 km later, the P0420 and P0430 codes have come back intermittently in the last few weeks.

Had the truck up on my buddy's hoist tonight and found a very tiny hairline crack at the y-pipe, bottom side. Marked in red in pic below.
You literally wouldn't notice it without a magnifying glass or running an exhaust leak test. Simple weld job fixed it right up.
I was somewhat surprised that tiny leak even that far from the downstream O2 can suck enough oxygen into the system to throw these codes.

 

[Rommel]

Had the CEL for the P0430 again, I unplugged the O2 sensor, cleaned the plug, put some dielectric grease on, and hopefully it will stay off that way.

 

[GoBucks!]

Anyone tried this product for the P0430 code? Amazon.com: EVIL ENERGY M18 x 1.5 O2 Oxygen Sensor Restrictor Fitting Adjustable Gas Flow Inserts Cel Fix Bung: Automotive

I installed it using the middle adapter but the code came back within a week. Do I now move to the more restrictive/closed adpater, or do I go to the more open ring?

 

[mercer59]

I have been going through the process of trying to figure out why my CEL kept coming on after trying a lot of the suggestions on this thread and getting various results. The one constant is that I always get the p0430 code. I had times when CEL would come on 5 miles after reset and as many as 225 miles before coming on. The most expensive thing I did was change all 4 O2 sensors. I have a 2005 4Runner with the 4.0 v6 and it runs strong with no real hint of cat problems. In researching I saw where a Toyota mechanic said to just run premium gas for a couple of weeks and thought why not? I filled up with 93 octane but mixed it with about half a tank of the lower octane that was already in vehicle and added a bottle of STP octane booster. Got to about a quarter tank and filled up with 93 and added Lucas octane booster. Drove about 50 miles and parked. Got in this morning drove about 5 miles and CEL was on. About an hour later got in to run to town and the CEL and VSC Trac lights were both off. Drove around, stopped and started vehicle multiple times and lights never came on again. I have never had the lights go off on their own, always had to reset.. I am crossing my fingers because all the crap that I have done to no avail is crazy if the fix was this simple. I will run this tank down and see what happens when I go back to regular gas. May come down to just having to add a $7.00 bottle of Lucas octane booster every other tank to keep the annoying lights out. Although even with lights on I never saw any kind of performance decline...

 

[duffdog]

I have been going through the process of trying to figure out why my CEL kept coming on after trying a lot of the suggestions on this thread and getting various results. The one constant is that I always get the p0430 code. I had times when CEL would come on 5 miles after reset and as many as 225 miles before coming on. The most expensive thing I did was change all 4 O2 sensors. I have a 2005 4Runner with the 4.0 v6 and it runs strong with no real hint of cat problems. In researching I saw where a Toyota mechanic said to just run premium gas for a couple of weeks and thought why not? I filled up with 93 octane but mixed it with about half a tank of the lower octane that was already in vehicle and added a bottle of STP octane booster. Got to about a quarter tank and filled up with 93 and added Lucas octane booster. Drove about 50 miles and parked. Got in this morning drove about 5 miles and CEL was on. About an hour later got in to run to town and the CEL and VSC Trac lights were both off. Drove around, stopped and started vehicle multiple times and lights never came on again. I have never had the lights go off on their own, always had to reset.. I am crossing my fingers because all the crap that I have done to no avail is crazy if the fix was this simple. I will run this tank down and see what happens when I go back to regular gas. May come down to just having to add a $7.00 bottle of Lucas octane booster every other tank to keep the annoying lights out. Although even with lights on I never saw any kind of performance decline...

I doubt your fix will work. The cats are bad. Either you get new cats, some spacers or I can make you these mini cat caps that will fix it:

Say Hello to my Lil Friend

Little known fact; the spacers cause a loss of about 1mpg vs. my mini-cats. I have proved that the signal is erratic with spacers in Techstream and the total engine efficiency is lower than with a solution like my cat caps.

 

[corydude99]

mini cats?

Duffdog, do you have pictures of your mini-cats that you make?

 

[Drcoffee]

I had the code on my lexus is300 with 250,000 miles. After spending $400+ In parts to replace all 4 O2 sensors and the code returned, I installed the anti-fouling adapters and the code never came back. Who gives a rats butt about 1mpg loss if the offset is $1500 to replace the cats? 10,000 miles/year ave at $2.20/gal = $71 loss in mpg. (18mpg vs 17mpg)

The spacers were $12 for a pair. You drill out one so the sensor can fit, then screw that one into the second spacer and install it on the exhaust. Super easy and it works. Whats odd was only bank 1 needed it. ��

 

[bwingnutt]

I have a 07 limited with a v8. I have over 254000 miles on it and no major problems. I have the secondary air pump problem and will take care of that with a kit from sly fox. I also have a hole in the cat that you can see when I dropped the pipes but was code free for a very long time. Think I will try the shop vac to test for leaks, I also got the freeze frame numbers. Shortf bank1 ,.8. Longft 1 was -.8. Shortft 2 3.9 and longft 2 was -.8. O2B1S2 (v) .175. O2B3S2. .195. O2B1S1. 3.106 (v). O2B3S1. 3.377(v). EQ RAT11. .986. EQ RAT 31. 1.042. O2S 31(ma). .047. Cat temps were1400 pre cat and 1000 post cat. So with numbers like this it showed that bank 2 has some minor differences. Could a pre cat leak cause this. Thanks to the forum for any help I get.

 

[duffdog]

I have a 07 limited with a v8. I have over 254000 miles on it and no major problems. I have the secondary air pump problem and will take care of that with a kit from sly fox. I also have a hole in the cat that you can see when I dropped the pipes but was code free for a very long time. Think I will try the shop vac to test for leaks, I also got the freeze frame numbers. Shortf bank1 ,.8. Longft 1 was -.8. Shortft 2 3.9 and longft 2 was -.8. O2B1S2 (v) .175. O2B3S2. .195. O2B1S1. 3.106 (v). O2B3S1. 3.377(v). EQ RAT11. .986. EQ RAT 31. 1.042. O2S 31(ma). .047. Cat temps were1400 pre cat and 1000 post cat. So with numbers like this it showed that bank 2 has some minor differences. Could a pre cat leak cause this. Thanks to the forum for any help I get.

A physical hole in the converter? Yeah - that will trip a code.

 

[Captsolo]

My v6 with 147k miles just yesterday started throwing the P0430 CEL, first mechanic I've taken it to said needs new cat at $750 without even looking at the vehicle. I passed....was going to take to another mechanic to get 2nd opinion. I sure don't want to waste money replacing the cat if that's not the true problem!

passenger side bank 1 oxygen sensor fix (PO420)

4runner p0420 cel fix - Bing video

 

[Brutalguyracing]

bank 2 on a v8 is driver side correct?

 

[Vespula]

bank 2 on a v8 is driver side correct?

I believe bank 2 is passenger on v8. (But driver on v6)

 

[Salvage02Runner]

Dreaded P0430

I believe bank 2 is passenger on v8. (But driver on v6)

Thank you for this. I googled a diagram and it seems you are right. I changed the driver's side 02 sensor and that didn't solve the issue. I switched the 02 sensor to the passenger side and so far so good!

 

[MrHoneycrisp]

Just adding tot his thread so that there is another data point online for someone to see.

I had the p0430 code come up the other day. I have a blutooth OBDII code reader and cleared it when I got home. The code reappeared in about another ~50ish miles.

Decided to order a new O2 sensor from Amazon (much cheaper than autozone for the exact same Denso Part number) along with a crows foot 22mm socket to help remove and install.

Swapped out the sensor (Driver side after the CC) the other day and have now gone over 250 miles and it hasn't popped back up. Going on a big drive in the coming weeks and will update if anything changes. Hoping it's not actually the CC though at least I live in a state that doesn't need to pass emission standards.

Also the electrical connection was just as difficult for me to remove as was the actual sensor. You need a lil screw driver to push the tab down, I couldn't get it with jsut my hand trying to squeeze. And it's also facing the rear of the vechicle which makes it harder tog et a visual on.


EDIT: I am on a 2006 v6 LTD