Replacement Cat Converter Choice Tracking Feedback/Discussion (re: P0420, P0430) - Second Generation Nissan Xterra Forums (2005+)
View Poll Results: IF you replaced cat converter(s), which brand did you buy?
OEM (Nissan) 13 16.67%
Walker 12 15.38%
Eastern Catalytic 24 30.77%
Magnaflow 14 17.95%
Bosal 5 6.41%
Davico 4 5.13%
Pacesetter 0 0%
Other (please specify in your post) 6 7.69%
Voters: 78. You may not vote on this poll

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post #1 of 220 (permalink) Old 10-15-2016, 04:22 PM Thread Starter
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Question Replacement Cat Converter Choice Tracking Feedback/Discussion (re: P0420, P0430)

I'd like to start a dialog to discuss primary catalytic converter replacement options.

I'm now with many others with a 10+ year old truck with 120,000+ mi. facing a cat code (P0430 in my case) and it's cat converter replacement time. I've been researching all the P0420 and P0430 threads here such as this one: https://www.thenewx.org/forum/11-powe...converter.html

Sounded like Paul-XYZ bought Eastern Catylitic and had codes return in 20k mi. Also saw a post by Robust saying he bought Walker and it had a bent bolt and bent flange which was an instant exhaust leak. Would like to know others experiences.

There is a lot of scattered info on here, and I'd like to create this thread to aggregate into centralized source of info for those in my situation.

I'd like to know what worked and didn't work.
-When did you replace? (xxx,xxx mi)?
-What brand?
-How well did it fit? ie was it bent wrong, missing bolts etc)
-How many miles since you replaced?
-Have any codes returned?
-Do you recommend, and any feedback?

Example made up feedback post:

Quote:
Originally Posted by JoeBlowXterraGuy123;

P0420

Replaced cat with Walker direct fit at 120k mi. One bolt was bent. Fitment was a total pain. Have had for 20k mi, no codes since.
So lets talk about the options out there guys!

Here's a cost breakdown for comparison of what I'm seeing:

Cat Converters   
    
OEM (Nissan)Part#Courtesy 
Left208A3-EA21B$567 
Right208A2-EA21B$567 
Core charge $280 
Shipping $0 
Initial OOP $1,414 
Total $1,134 
    
WakerPart#AmazonRock Auto
Left16468$197$185
Right16467$170$161
Shipping $0$21
Total $367$367
    
EasternPart#AmazonRock Auto
Left40710$204$185
Right40711$205$172
Shipping $0$14
Total $409$371
    
DavicoPart#AmazonRock Auto
Left58238x$155
Right58239x$158
Shipping $0$12
Total $0$325
    
BosalPart#AmazonRock Auto
Left0961459$238$202
Right0961458$251$202
Shipping $0$13
Total $489$417
    
MagnaflowPart#AmazonAutoanything
Left49212$183$236
Right49214$204$236
Shipping $0?
Total $387$472
    
Evan FischerPart#Amazon 
Pair (L&R set)SET-REPN960313$343 
Shipping $0 
Total $343 
    
PacesetterPart#Amazonbad fit reviews
Left201078$169 
Right201082$150 
Shipping $0 
Total $319 
    

*Note: some include gaskets and bolts others require separate purchase
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Last edited by Surf and Snow; 10-18-2016 at 02:13 AM.
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post #2 of 220 (permalink) Old 10-15-2016, 04:25 PM Thread Starter
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For those curious what it looks like when you have a cat going bad. The following is an excerpt from the FSM:


DTC P0420, P0430 THREE WAY CATALYST FUNCTION
On Board Diagnosis Logic

The ECM monitors the switching frequency ratio of air fuel ratio (A/F) sensor 1 and heated oxygen sensor 2. A three way catalyst (manifold) with high oxygen storage capacity will indicate a low switching frequency of heated oxygen sensor 2. As oxygen storage capacity decreases, the heated oxygen sensor 2 switching frequency will increase. When the frequency ratio of air fuel ratio (A/F) sensor 1 and heated oxygen sensor 2 approaches a specified limit value, the three way catalyst (manifold) malfunction is diagnosed.


This video shows my B2 O2 S2 sensor high switching frequency indicating low oxygen storage thus setting a code for cat converter efficiency below threshold. In this case bank 2 (P0430) If you watch the botom right (B2 O2S2) you will see it switching way low to high. Compare that to B1 O2S2 at the bottom left which is much more consisitant.

The typical average values should be about:
B1 O2S1 ~0.3V, B2 O2S1 ~0.6V
B1 O2S2 ~0.6-0.7V, B2 O2S2 ~0.6-0.7V

Heres the vid:

Before (bad fluctuating B2 O2 S2 voltage):


After (good steady B2 O2 S2 voltage):


Hopefully this will help others in their diagnosis and understanding of what the ECM is looking for to trigger a P0420 (Bank 1) or P0430 (Bank 2) Catalytic Converter Efficiency Below Threshold code.

FWIW, at the time of this "Before" video mine has reached the point it will set the code within 100-200 miles after clearing. In fact it set only 30 miles after I cleared it.

Something else to consider and examine: Look at your Long Term Fuel Trims. If you see one side is way low, this will indicate it is taking away fule on that side because it is running rich. And if way high its adding fuel because the enine is running lean. This indicates a problem other than just age that is causing the cat to fail. In my case both banks are the same and normal. Thus indicating the converter has simply began to fail and run out of oxygen storage. ymmv

-Jay

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Last edited by Surf and Snow; 11-23-2016 at 03:34 AM.
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post #3 of 220 (permalink) Old 10-15-2016, 05:04 PM
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post #4 of 220 (permalink) Old 10-15-2016, 05:05 PM
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As a California resident and owner of a 2005 Xterra with almost 123,000 miles, I am particularly interested in information regarding CARB-approved and 50-state replacement cats.
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post #5 of 220 (permalink) Old 10-15-2016, 05:53 PM
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Sorry no long term report or fitment info but I did buy a set of davico's I'm gonna throw on as soon as I have the time, my drivers side has gone bad,hope they work out. I bought a complete set but only need the drivers so I'll be selling the passenger side it looks to have been replaced at some time.

Last edited by nczo6; 10-16-2016 at 02:34 PM.
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post #6 of 220 (permalink) Old 10-16-2016, 02:48 AM Thread Starter
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I just added a reference table of part numbers and costs.

Side note: Has anyone tried Magnaflow or Evan Fisher? Looking at those two right now.

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Last edited by Surf and Snow; 10-16-2016 at 03:02 AM.
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post #7 of 220 (permalink) Old 10-16-2016, 04:09 AM
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This will be very helpful as I am needing replacements ASAP.


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post #8 of 220 (permalink) Old 10-16-2016, 02:04 PM Thread Starter
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Thanks for the input so far RANGERSTRANGE and nczo6.

Can anyone else contribute?

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post #9 of 220 (permalink) Old 10-16-2016, 02:58 PM
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Quote:
Originally Posted by Surf and Snow View Post
. . . Can anyone else contribute?
@Surf and Snow:

I know this doesn't help your search for the best or most cost effective replacement cats for an Oregon vehicle, but here's what I found that applies to those of us in California and N.Y.:

OEM - CARB approved - 50 State legal (and of course the most expensive)

Walker - Not Legal for Sale or Use in CA (Walker oxygen sensors are CARB approved but not Walker catalytic converters)

Eastern - Not Legal for Sale or Use in CA & NY

Davico - Not Legal for Sale or Use in CA & NY

Bosal - Not Legal for Sale or Use in CA

Magnaflow - Not Legal for Sale or Use in CA

Evan Fischer - Not Legal for Sale or Use in CA & NY

A Google search for CARB-approved or California legal catalytic converters, also searches on AutoZone.com, OReillyauto.com, and NapaOnline.com, have all turned up nothing. Thus far the only California legal cats I can find are OEM.

Sometimes I feel like telling the Kalifornia smog nazis that they can kiss my exhaust.
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post #10 of 220 (permalink) Old 10-16-2016, 03:31 PM Thread Starter
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Thank you for the info to help others @Mr. Bills

California is always unreasonably restrictive on everything (even lawn mower gas cans). Here in Portland, OR I am subject to emissions testing requirements for vehicle registration every 2 years. Fortunately there is no visual inspection component. For pre-OBD2 (<1996) they get a sniff test, and for all 1996+ its just a scan. Monitors need to show as complete and no P codes to pass, so fortunately for me, all these aftermarket cats are viable. But your contribution is certainly helpful for all our CA and NY members.

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