Does the 2.5L engine have 2 catalytic converter? - Nissan Forums : Nissan Forum
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post #1 of 16 Old 06-19-2010, 02:45 AM Thread Starter
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Does the 2.5L engine have 2 catalytic converter?

Well today my dealer told me my catalyst converter was bad. I assumed he was talking about the main one underneath the car since he did not say "precat".

I looked on my receipt and they replaced the manifold which shocked me since I thought the manifold included the "precat".

Can someone tell me every single component to 2.5L exhaust system (stock)?

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post #2 of 16 Old 06-19-2010, 02:54 AM
Tismoed 1 part at a time.
 
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Should be one after the header (AKA) precat and the main cat under the car right before the resonator.



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Last edited by Tarik; 06-19-2010 at 02:17 PM.
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post #3 of 16 Old 06-19-2010, 03:04 AM Thread Starter
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I am looking under the car now. I see 4 main components from engine to bumper.

1). Exhaust manifold with precat. 100% sure
2). main cat not completely sure
3) resonator (very long) not sure.
4) muffler (right by the bumper) not sure.

Can someone verify these parts?
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post #4 of 16 Old 06-19-2010, 03:08 AM
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From front to back you will see this

1) Manifold with precat
2) Flexpipe
3) Main cat (looks like a pipe balloon)
4) Resonater that is long as shit
5) Big ass muffler by the bumper that dumps out to 2 small exhaust tips.

Thats all!

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post #5 of 16 Old 06-19-2010, 03:28 AM Thread Starter
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Here pictures of the components minus the flex pipe.

Correctly labeled according to 200hpAltima?

manifold with precat


main cat


resonator


muffler


I want to make sure these are correct before I call the dealer about this issue we (service guy) are having about terminology.

Last edited by bob1234; 06-19-2010 at 03:31 AM.
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post #6 of 16 Old 06-19-2010, 03:31 AM
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you got it

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post #7 of 16 Old 06-19-2010, 04:22 AM
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Look at the beautiful crimp before the converter, thanks nissan

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post #8 of 16 Old 06-19-2010, 04:24 AM
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Quote:
Originally Posted by bob1234 View Post
Here pictures of the components minus the flex pipe.

Correctly labeled according to 200hpAltima?

manifold with precat


main cat


resonator


muffler


I want to make sure these are correct before I call the dealer about this issue we (service guy) are having about terminology.
correct


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post #9 of 16 Old 06-19-2010, 05:13 AM Thread Starter
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Thanks everyone. I hate taking the car to the dealer, but I wanted to make sure the code was the precat (p0420). When the service guy called telling me it was the cat under the car, I did not want to mess with cutting the pipe and find someone to weld a new cat back on. So, I decided to have the dealer change the cat underneath.

I found out when I popped the hood the precat looks new which really ticked me off.

So make sure your service guy knows his stuff. I could have just paid them $95 to diagnose the problem and I would have changed the precat myself.

Last edited by bob1234; 06-19-2010 at 07:52 PM.
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post #10 of 16 Old 06-21-2010, 03:12 AM
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Quote:
Originally Posted by bob1234 View Post
Thanks everyone. I hate taking the car to the dealer, but I wanted to make sure the code was the precat (p0420). When the service guy called telling me it was the cat under the car, I did not want to mess with cutting the pipe and find someone to weld a new cat back on. So, I decided to have the dealer change the cat underneath.

I found out when I popped the hood the precat looks new which really ticked me off.

So make sure your service guy knows his stuff. I could have just paid them $95 to diagnose the problem and I would have changed the precat myself.
I dont think im following you correctly, b/c even the cat underneath the car is gonna come as a pipe assembly with no welding required....

and the manifold cat on the 2.5's are always the ones to shit.

what year and how many miles do you have?
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post #11 of 16 Old 06-21-2010, 04:14 AM Thread Starter
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I was thinking the dealer had universal cats for most of their cars, but I now think they would just replace the whole front tube assembly.

I have a 2005 2.5 with around 131,000 miles on it.
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post #12 of 16 Old 06-21-2010, 04:37 AM
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Quote:
Originally Posted by bob1234 View Post
I was thinking the dealer had universal cats for most of their cars, but I now think they would just replace the whole front tube assembly.

I have a 2005 2.5 with around 131,000 miles on it.
For the most part when you go to a dealer, nothing is "universal" i bet the part number for your manifold was a 14002-9J130?
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post #13 of 16 Old 11-23-2016, 07:47 PM
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So if the shop (a good shop, not a bunch of hacks) quoted me $500 for the Cat and I confirmed that price with an exhaust specialist but didn't specify if they are replacing only the front or the front and lower cat...should I ASSUME they were only going to replace the front?

I found it here for half the price with a straight forward video on how to replace it for $260 (retail $500):
https://www.1aauto.com/2002-06-nissa...=342404&y=2004

Then I noticed the lower cat is listed for $206.00 on the same site:
https://www.1aauto.com/2002-06-nissa...ALLATION_VIDEO

I have GOT to save money on this repair, so I've got a friend who will help me do it right. But I don't want to burn bridges with the shop asking them "oh, is it just the front? or is the front and the the one underneath?" And just not come back.

I'll be having them do some other work on it soon, but currently don't know if they're trying to replace one or both.

Vehicle is s 2004 Altima 2.5 with 185k miles
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post #14 of 16 Old 11-23-2016, 08:06 PM
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Hmmm, waking up a 6+ year dead thread...

So be careful, the P0420 code can often mean far more serious things are wrong with the engine. At least your car is of the age and mileage where a new cat and/or pre-cat could reasonably be needed, Inspect the top of the precat element careful for signs of breakdown and stop there before spending any more money as the engine could be toast (google: nissan precat failure)

If your friend could help you drop the pre-cat for inspection...and on the 2.5 I think that also includes the integrated exhaust manifold, that would be a great idea before puchasing new parts. Shouldn't cost you more than the time and a gasket to do it.

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post #15 of 16 Old 11-23-2016, 08:36 PM
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Her engine has cut off from time to time at slow speed and is throwing the code for the camshaft/crankshaft position sensor too. I replaced the camshaft sensor (the tough one on the back) around 100k miles with the 3rd generation metal version with the bolt on the easier to install side and it fixed that error code then.

So at the time, I ordered a pair of the sensors. I never replaced the crankshaft one. So the shop showed me yesterday where the crankshaft sensor is leaking oil around it's edges and I've going to replace that one.

I can't find any distinct list of behaviors for the pre-cat failure sucking into the engine. The engine doesn't run rough or lag. Just a bit out of tune from what I can tell and the shutting off at just above idle in a parking lot behavior is symptomatic of hte cam/crankshaft position monitor code.

What am I looking for on the pre-cat? Engine doesn't seem to be toast. No smoke out the back, no major rattle that I can tell. I did check some time back to make sure it's not the engine model that has the little screw that comes loose and sucks into the engine. It had the EGR re-program done years ago when it was under warranty and it's eaten at least 2 fuel pumps in it's lifetime (typical for this thing).

Is there an engine behavior tip off to think the engine might be roasted? There are so many random postings across so many forums and YouTube videos.
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