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My CAT fell off! - 2007 Volvo XC70

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cmayo1
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Post by cmayo1 »

So, I went to the post office to pick up a package. Went inside, gave my autograph, and was ready to head to work. Got outside and saw my tail pipe laying on the ground... great. The whole system has been leaking for a while, and I've been holding off on replacing it. I thought "maybe I can just hitch it back on and get to work". I got on the ground ( while it's snowing :D ) and looked, only to see the catalytic converter hanging off too.

Free custom exhaust!

I'm having the whole thing done over, including the CAT, but my question is two fold:

1. Has anyone run into code issues with an aftermarket CAT? I can't afford an OEM one
2. Has anyone run into code issues with aftermarket O2 sensors?

Thank you,

Christopher
2007 Volvo XC70

free time ≠ money

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BlackBart
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Post by BlackBart »

*checks location>>>>>New Hampshire. Yep.
ex-1984 245T wagon
1994 850T5 wagon
2004 XC70 wagon BlackBetty

cmayo1
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Post by cmayo1 »

We really should change our State Mineral to rust
2007 Volvo XC70

free time ≠ money

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jonesg
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Post by jonesg »

cmayo1 wrote: 27 Feb 2025, 13:15 So, I went to the post office to pick up a package. Went inside, gave my autograph, and was ready to head to work. Got outside and saw my tail pipe laying on the ground... great. The whole system has been leaking for a while, and I've been holding off on replacing it. I thought "maybe I can just hitch it back on and get to work". I got on the ground ( while it's snowing :D ) and looked, only to see the catalytic converter hanging off too.

Free custom exhaust!

I'm having the whole thing done over, including the CAT, but my question is two fold:

1. Has anyone run into code issues with an aftermarket CAT? I can't afford an OEM one
2. Has anyone run into code issues with aftermarket O2 sensors?

Thank you,

Christopher
yes and yes both questions.
I don't thinkl you can even get an OEM cat.
Get it welded.

cmayo1
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Post by cmayo1 »

jonesg wrote: 27 Feb 2025, 20:36 yes and yes both questions.
I don't thinkl you can even get an OEM cat.
Get it welded.
Why do I need to weld it? What am I welding?
2007 Volvo XC70

free time ≠ money

vtl
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Post by vtl »

Upstream sensor - OE or matching Bosch only. Can look up part number at FCP.

Downstream sensor - get yourself a Hiltone tune, it disables CAT efficiency check (no codes) :) Otherwise you will probably get codes with ceramic Magnaflow or whatever ceramic CAT you've got.

Do you still have your old cat? Don't get rid of it yet.

scot850
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Post by scot850 »

Volvo cats are still available and really reasonable up here at ONLY $3000 CDN!!? Yikes, what are they made of? Pure gold?

I replaced the crappy Toyota exhaust manifolds and Y Pipe on my V8 4Runner with a stainless steel tubular aftermarket unit and high flow cats (there are 2 of those). To stop them tripping the O2 sensors, they fitted a spacer bung welded to the O2 sensor hole to move them out of the flow a little which prevents the O2 sensors from setting off the check light. Not sure if that would work on the Volvo but might. I've had no issues other than a more efficient system with more power than OE.

Neil.
Last edited by scot850 on 28 Feb 2025, 08:15, edited 1 time in total.
2006 V70 2.5T AWD Polestar tune
2000 V70 R - still being an endless PITA
2006 XC70 - Our son now has this and still parked in our garage
2003 Toyota 4Runner V8 Limited
2015 Kia Sportage EX-L - Sold
1993 850 GLT -Sold
1998 V70 XC - Sold
1997 Volvo 850 SE NA - Went to niece in California - Sold
2000 V70 SE NA - Sold

vtl
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Post by vtl »

scot850 wrote: 28 Feb 2025, 08:11 Volvo cats are still available and really reasonable up here at ONLY $3000 CDN!!? Yikes, what are they made of? Pure gold?

Neil.
Pure gold would run them cheaper. OE cat is full metal (precious metal).

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jonesg
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Post by jonesg »

cmayo1 wrote: 28 Feb 2025, 05:25
jonesg wrote: 27 Feb 2025, 20:36 yes and yes both questions.
I don't thinkl you can even get an OEM cat.
Get it welded.
Why do I need to weld it? What am I welding?
the flex pipe is welded to the cat, the aft cat flange joint is just bolted and can be fixed or welded.
I'm in Maine and couldn't get a suitable downpipe/cat shipped here, autozone wanted $900 ,
so I bought a welder and welded in a new flex pipe section.
If the cat was hanging loose .. that can damage the flex pipe.

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br0dy519
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Post by br0dy519 »

Re: the bung. Used that trick on an old MPV you can buy a DORMAN spark plug non fouler and it fits perfectly.
04s60 2.4
04xc70 2.5t
prwood wrote:I wish I had a permanent car repair area that was covered, had a level surface, lighting and fans, a workbench, and tool cabinets. You know,like a garage. Much of my time during the job is spent hauling things up and down the stairs to the basement or in and out of the storage shed, or running back downstairs when I realize I need something else,or taking a break from standing out in the sun,or using flashlights or work lamps when it gets dark.

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