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Unread 07-11-2011, 01:01 PM   #1
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Default P0430 on a 96 Taurus

A month before I have to do the mandatory Smog Check the car decided to light up the check engine light.

P0430 - Catalyst System Efficiency Below Threshold (Bank 2)

About a month ago or so I had another code, P0136 which ended up being the downstream O2 sensor for Bank 1.

Now Bank 2 seems to have a similar problem.

Do you guys think that the cat has gone bad?

Or could it also be the downstream sensor on the other bank?

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Unread 07-11-2011, 02:26 PM   #2
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I'm not sure if you have 2 cats or one, but the one on bank 2 is below threshold, meaning it's not doing what it's supposed to do.

Any time after 100,000 miles the cat can go bad.
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Unread 07-11-2011, 02:52 PM   #3
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There are two cats, one for each bank.

The car is at about 130k so I guess it could have gone bad.

Any way to check whether it has gone without actually replacing it?

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Unread 07-11-2011, 03:17 PM   #4
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You could compare the inlet vs. outlet temp with an infrared scanner, a working cat has a higher outlet temp than inlet. But that is not absolute as it could be working somewhat and the O2 is better at reading it.

So far every time I've got that code it's turned out to be the cat.

When you have it replaced, ask for the old cat back and search CL for buyers. You might get $50-100 for it.
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Unread 07-11-2011, 06:18 PM   #5
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Ok, so the cat has to go.

Now, should I replace the whole Y pipe assembly with both cats or should I have somebody cut out just the cat and weld on a universal one?

This is how the cat assembly looks.
I had a P0136 about a month back and O2 sensor replacement fixed that.



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Unread 07-11-2011, 07:08 PM   #6
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I'd seriously consider replacing the whole Y-pipe and cat assembly. If one is gone now, you can be sure the other is not far behind. It's like when your shoes wear thin and you get a hole in one, the other shoe is close behind.

And besides, welding a cat in place on that Y-pipe is really tough to get a good seal at the top while in the car. If they remove it you have already paid for the labor to re & re a new pipe.
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Unread 07-11-2011, 09:26 PM   #7
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It will be a tough decision.

And because I am in California the cat has to be Cali legal, meaning that the whole Y assemble costs around $1000.

The cat itself costs $300 a piece.

I found a few shops in the area and will give them a call tomorrow to see how much they would charge.

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Unread 07-11-2011, 11:37 PM   #8
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$389 on ebay
1996-99 Taurus/Sable 3.0L Y-Pipe Catalytic Converter | eBay

You'd have to check with the seller about Cali legal
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Unread 07-12-2011, 12:54 AM   #9
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Quote:
Originally Posted by Mr Car Guy View Post
$389 on ebay
1996-99 Taurus/Sable 3.0L Y-Pipe Catalytic Converter | eBay

You'd have to check with the seller about Cali legal
The BS part about CA legal cats is that there isnt any difference between a CA legal cat and a regular cat. All the CA legal process entails is the manufacturer of the cat paying the state of CA to give them a number to engrave on the cat making it legal. Its the same with all CA legal performance parts, its all upto whether the parts manufacturer payed the state to be able to put smog exemption stickers on their parts.

Its not about emissions at all, its all just a money making racket for the state of CA (by basically taxing the aftermarket). The sad part is that the state is still broke. Just last week when I was at the county courthouse there was a line of people through the building and out the door to pay traffic fines probably averaging $300/ea. And the state is still broke... its incredible.

I hate California...
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Unread 07-12-2011, 07:15 PM   #10
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I just checked, that Magnaflow isn't CARB compliant.

Amazon.com: BOSAL EXHAUST Catalytic Converter 079-4091 New: Automotive Amazon.com: BOSAL EXHAUST Catalytic Converter 079-4091 New: Automotive
That one is though...not a thousand bucks.
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