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Old 02-02-2013, 06:57 PM   #1
Zeroe31890
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Replacing my catalytic converter

I need help figuring out how to properly buy a catalytic converter for my 2000 ZX3. My engine light is on and I am getting code P0422, and unfortunately the cat is the most likely culprit. I also have error P0455, but I don't think that is causing the cat to give that error, but I mention it just incase it may.

Anyways, I have done some research and found out it'll cost between $500 to $1400 to get that fixed (odds are the larger range). I have searched for cats online, and have seen stuff ranging from $100 to $300. I would rather do it myself to save money. Problem is I need to make sure it will make the engine light turn off and make sure the cat works well enough to get me to my internship as well as pass inspection. Hopefully someone can help me figure it out. I believe my cars engine is a 2.0L I4 SOHC 8V FI Engine. I really appreciate any advice and help in the matter!


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Old 02-02-2013, 09:31 PM   #2
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For starters, the ZX3 was only ever fitted with the 2.0 liter DOHC (Double Overhead Cam) engine. The SOHC engine type you've quoted is not the correct one.
New catalysts are expensive due to the materials that go into making them. Finding a used one at the junkyard may be a better bet if cost is an issue as 1) you're ensured a correct fit and 2) cost will be considerably less than a new one.
Catalysts can be diffcult to remove if you have only a basic tool set. You need to remove the upstream 02 sensor (requires a special socket) and undo a large EGR tube nut. Rusty fasteners through out can also be problematic.
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Old 02-02-2013, 10:35 PM   #3
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Oh i'm sorry. You are probably right. Thanks for correcting me.

Quote:
Originally Posted by BC_ZX3 View Post
For starters, the ZX3 was only ever fitted with the 2.0 liter DOHC (Double Overhead Cam) engine. The SOHC engine type you've quoted is not the correct one.
New catalysts are expensive due to the materials that go into making them. Finding a used one at the junkyard may be a better bet if cost is an issue as 1) you're ensured a correct fit and 2) cost will be considerably less than a new one.
Catalysts can be diffcult to remove if you have only a basic tool set. You need to remove the upstream 02 sensor (requires a special socket) and undo a large EGR tube nut. Rusty fasteners through out can also be problematic.
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Old 02-02-2013, 09:53 PM   #4
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Much cheaper to buy an aftermarket cat or one from a junk yard. You can get one from HERE at CFM or even cross shop the part numbers to find it else where.
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Old 02-06-2013, 05:47 PM   #5
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Thanks for the link! I do have one concern though. I read in a few different places that using an after market cat could potentially not make the check engine light go off? Another issue would be fitting it in my specific model. At least the second part was explained to me at a ford dealership. Your thoughts or advice?
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Old 02-03-2013, 03:38 PM   #6
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Before swapping the cat out, replace BOTH the upstream and downstream O2 sensors with new sensors and see if the check engine light goes away. it will cost about $100 for 2 bosch sensors from the parts place but you may just have a bad sensor. This is a DIY project you just need a O2 socket, a socket wrench, and a jack and jackstands.

And, if this does not fix it then if you buy a brand new cat to replace it, you will find the small print requires that you replace all O2 sensors when you replace the cat or the manufacturer will not warranty it, so it's not money down the rathole.

Where I live every cat that comes into a wrecker goes straight to the metal recycler, you can't find used ones that way.
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Old 02-03-2013, 03:44 PM   #7
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The O2s are most likely fine as it only sets this cat code when it sees the activity from the rear sensor mirroring the front sensor, thereby it assumes the cat isn't doing anything.
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Old 02-21-2013, 07:16 PM   #8
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Cats do not just go bad. People kill em with bad gas and additives. Pull the o2 sensors out and clean the thermocouples(can) around it with emeory cloth. Thread em back in with never sieze , reset you code light and put a bottle of Sea Foam or a pint of Colemans Camp Fuel to the gas tank. I doubt the cat. is bad. Drive it like you stole it . All's will be well again.
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Old 02-03-2013, 04:01 PM   #9
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jetrinka, I bought a used 2001 Focus SE back in December that was giving me that code and replacing both O2 sensors fixed the problem. I bought it knowing that code was set and assuming I would have to replace the cat, so it was a nice Christmans present from the auto gods i guess.

I know what the theory says but this is one area where practice differ in how Ford implemented it. In fact when I went to buy the sensor I had the OReilly parts manager confirm the code read with their scan tool (since I use a cheap $9.99 Chinese USB-to-laptop OBD scanner) and the parts guy said that usually only changing the front sensor was needed to fix that problem. I did both because I figured if one was bad the other was at the old rage stage also.
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Old 02-21-2013, 01:34 PM   #10
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You said that you had error code P0422. When you changed both 02 sensors that actually worked? Cuz I dont have the money to replace a cat and inspection is in a few days.
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