Do I really need a new Cat? - Page 2 - Nissan Xterra Forum
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post #11 of 20 Old 01-12-2017, 10:57 AM
beef tits
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I'd suggest investing in an OBD-2 scanner. You don't need a fancy one, a $26 no-frills device works fine.

https://www.amazon.com/Diagnostic-Sc...+scanner&psc=1

Scan, clear and see what happens. I get random codes here and there that I clear and never see again.

I'd suspect bad cats before bad O2 sensors, it's pretty rare that O2 sensors actually fail. I also drive a 2000 which is probably a lot more likely to have the cats go bad.

2000 Frontier XE CC (4x4 parts lift, Eaton rear locker, 4x4 parts skid plate, BFG KO2s, Calmini sliders and bumper, Warn winch, Warn hubs, DT headers & full exh., lots of scratches and dents)
2011 Honda CRZ (stock)
2013 Ducati Hyperstrada (stock)
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post #12 of 20 Old 01-12-2017, 11:11 AM Thread Starter
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I said in a previous thread that first my sensor 1 bank 1 (i believe) 02 sensor went bad, then shortly after all my 02 sensors went, THEN my SES light turned off on it's own and stayed off for 200 miles then came back on with only a new code, p0430 catalyst system efficiency below threshold, and recently my SES turned off on its own again but came back on withing 20 miles, Do you not suspect this is the work of a faulty engine wiring harness? I wish someone would tell me which of the many points I need to get the corrosion off. How can I test visually for a bad cat?
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post #13 of 20 Old 01-12-2017, 11:32 AM
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You also said you didn't have a scanner. I highly recommend you drop $20 and get one. It's a critical tool to have if you are going to drive shitty old trucks like ours.

I've never heard of or experienced a bad wiring harness on mine so I can't help you there other than suggest that you might have more than one problem. Or maybe you don't and you need to clean more grounds. Either way it will be a hell of a lot easier to diagnose if you have a scanner. Unless you like going to Vato Zone every other day.

Also, dirty grounds do not equate to a bad harness. Wiring harnesses don't just go bad unless they've been hacked into or modified or damaged in some way. Unless your car was in a wreck, owned by a moron, or has severe corrosion issues I would rule out a bad harness.


Regarding cats;

The best way to check your cats is to take an IR temperature scanner and see what the temp rise is across the cat after it's been running a while. Consult Google for more details but temp should be hotter on the outlet, I believe.

Since you balked at buying a $20 scanner, I am guessing you don't want a $500 IR. Your other option is to remove and inspect them. If they are bad you'll see obvious melting or the core will be loose, or turning to dust or rattling around. If it still looks like a new cat inside, chances are it's not bad.

The cracks in my manifold were so small I could barely see them at first, and the sound wasn't that loud. However, leaking manifolds will lead to your cats going bad and O2 sensor CEL lights. This is a very common problem on the earlier models.

2000 Frontier XE CC (4x4 parts lift, Eaton rear locker, 4x4 parts skid plate, BFG KO2s, Calmini sliders and bumper, Warn winch, Warn hubs, DT headers & full exh., lots of scratches and dents)
2011 Honda CRZ (stock)
2013 Ducati Hyperstrada (stock)

Last edited by beef tits; 01-12-2017 at 11:37 AM.
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post #14 of 20 Old 01-12-2017, 11:39 AM Thread Starter
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In my research it seems first gen xterras have a "Technical Service bulletin" about the wiring harness going bad. I guess I could buy a scanner, those also clear codes? what other grounds do I need to look at? Would you know anything about what GrnXnham said, So far he is the most relatable but has gone quiet. I appreciate you getting back with me
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post #15 of 20 Old 01-12-2017, 11:45 AM
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Yes, the scanner will clear as well as identify codes. It's the best $20 I ever spent.

I would look for that specific TSB and see what they say. Again, I have not had this problem so I don't know specific grounds to check. Then again, they are pretty easy to find and you could probably just clean them all pretty fast. Any wire (typically black) that is bolted directly to the frame, trans or the engine is probably a ground.

2000 Frontier XE CC (4x4 parts lift, Eaton rear locker, 4x4 parts skid plate, BFG KO2s, Calmini sliders and bumper, Warn winch, Warn hubs, DT headers & full exh., lots of scratches and dents)
2011 Honda CRZ (stock)
2013 Ducati Hyperstrada (stock)
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post #16 of 20 Old 01-12-2017, 12:27 PM Thread Starter
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I actually dont know where to find that, Ive only seen it mentioned in a few threads with problems similar to mine, I actually cant find a thread here that states it but I found the other one I saw her in post #7 http://x.nissanhelp.com/forums/xterr...-read-bad.html
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post #17 of 20 Old 01-12-2017, 12:43 PM
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Have you replaced the cracked manifold(s)? If so, was doing so worth the effort?
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post #18 of 20 Old 01-12-2017, 02:37 PM Thread Starter
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Quote:
Originally Posted by JLBinHSV View Post
Have you replaced the cracked manifold(s)? If so, was doing so worth the effort?
I dont have cracked manifolds

Here is the other thread that mentions the 2004 service bulletin http://www.clubxterra.org/forums/showthread.php?t=20845
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post #19 of 20 Old 01-12-2017, 02:43 PM
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My question was aimed at beeftits. Sorry for the confusion.
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post #20 of 20 Old 01-12-2017, 03:34 PM
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Quote:
Originally Posted by JLBinHSV View Post
My question was aimed at beeftits. Sorry for the confusion.
I replaced them with headers, CEL eliminators and added secondary cats as the headers eliminated the primary cats.

Runs great now. Not a huge power increase but the headers were only a little more than the 02-04 style manifolds which are the only other good option for replacement IMO.

Replacing the 00-01 manifold with another 00-01 manifold is just asking to have to do it all over again.

2000 Frontier XE CC (4x4 parts lift, Eaton rear locker, 4x4 parts skid plate, BFG KO2s, Calmini sliders and bumper, Warn winch, Warn hubs, DT headers & full exh., lots of scratches and dents)
2011 Honda CRZ (stock)
2013 Ducati Hyperstrada (stock)
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2004 xterra , catalytic converter , fuel level sensor , oxygen sensor , wire harness

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