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Old 12-14-2016, 05:40 AM   #1
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2.4L catalytic converter??

So my engine light came on and it's p0240 which means I need a new catalytic right? So I'm looking on Amazon and being that I live in California I couldn't find any that were not non carb. Called a couple of shops around town and they didn't have any either :/
Anyone in California with the 2.4 have any luck finding one and that's not a crazy amount of money?
BTW the year is a 2003
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Old 12-14-2016, 09:28 AM   #2
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Maybe maybe not
Could also be a tired downstream oxygen sensor


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Old 12-14-2016, 10:56 AM   #3
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0420 or 0240? 0420 is the general code for catalyst efficiently issues.
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Old 12-14-2016, 11:09 AM   #4
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As measured by the down stream oxygen sensor data so if sensor is bad garbage data goes to garbage results

If you believe otherwise share with me how else the PCM can evaluate cat efficiency as always ready to learn.


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Old 12-14-2016, 04:04 PM   #5
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This is what I got from my scanner.
How do I test for a bad 02 sensor and how do I find out if it's the o2 or the cat.


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Old 12-14-2016, 06:09 PM   #6
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Real sniffer numbers at the tail pipe would tell the tail

Alternatively
Live scope data on O2 sensors would add some clarification

Or you can just throw expensive parts at it and hope something works.
The ready fire aim approach that frustrates owners and makes shops rich


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Old 12-14-2016, 10:22 PM   #7
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Like Digger stated, take it to a test only shop for readings. CA is a pita, you do not want a failure in the system. If it fails, you will have to go to a certified smog shop for inspection and testing.

You can also clear out all codes and see what happens. Give it about 20 miles of driving to give the computer time to reset.

@Digger84 , not sure if your other post was directed at me but, in my very limited knowledge of emissions/driveability issues, the downstream sensor measures the co2 ( and other emissions) difference between it and the upstream sensor to determine how well the cat is functioning. Again, my understanding of the system is very basic.
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Old 12-15-2016, 04:04 AM   #8
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Originally Posted by Rob5589 View Post
Like Digger stated, take it to a test only shop for readings. CA is a pita, you do not want a failure in the system. If it fails, you will have to go to a certified smog shop for inspection and testing.

You can also clear out all codes and see what happens. Give it about 20 miles of driving to give the computer time to reset.

@Digger84 , not sure if your other post was directed at me but, in my very limited knowledge of emissions/driveability issues, the downstream sensor measures the co2 ( and other emissions) difference between it and the upstream sensor to determine how well the cat is functioning. Again, my understanding of the system is very basic.
So your saying just take it for testing, But if it fails I'll have to get it fixed right away?
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Old 12-15-2016, 05:44 AM   #9
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So your saying just take it for testing, But if it fails I'll have to get it fixed right away?
You can take it to a test only shop so that any issue that comes up isn't transmitted to the state. That way it can be taken care of prior to an actual smog check. It cannot be smogged with a cel on, even if the light goes out it stays in the computer unless cleared. If you take it for an actual test and it fails you will need to have it fixed and go to a state referee station. But either way it needs to be repaired or at a minimum looked at by a professional.
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Old 12-15-2016, 09:18 PM   #10
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Originally Posted by Rob5589 View Post

You can take it to a test only shop so that any issue that comes up isn't transmitted to the state. That way it can be taken care of prior to an actual smog check. It cannot be smogged with a cel on, even if the light goes out it stays in the computer unless cleared. If you take it for an actual test and it fails you will need to have it fixed and go to a state referee station. But either way it needs to be repaired or at a minimum looked at by a professional.
Thanks!I ill do that this weekend. Have you heard about putting lacquer thinner in the gas tank? 1 gallon lacquer to half a tank of gas, It's supposed to clean it out.
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Old 12-15-2016, 09:19 PM   #11
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No sounds like a bad idea

Might even damage the plastic tank or lines


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Old 12-15-2016, 09:25 PM   #12
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Just for clarification the TJ uses narrow band oxygen sensors that generate a voltage based on the oxygen gradient (difference oxygen content in exhaust vs outside air)

Higher exhaust oxygen makes for lower gradient thus lower voltage from sensor

The sensor in no way measures co2

What the computer expects to see is the pre cat do some more combustion so it expects the down stream sensor after the pre cat to see less oxygen and there fore greater gradient and thus higher voltage then upstream

Besides a tired cat you could have outside air with oxygen leaking in before down stream sensor or a tired sensor


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Old 12-15-2016, 09:40 PM   #13
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Thanks!I ill do that this weekend. Have you heard about putting lacquer thinner in the gas tank? 1 gallon lacquer to half a tank of gas, It's supposed to clean it out.
No, no, no...

Quote:
Originally Posted by Digger84 View Post
Just for clarification the TJ uses narrow band oxygen sensors that generate a voltage based on the oxygen gradient (difference oxygen content in exhaust vs outside air)

Higher exhaust oxygen makes for lower gradient thus lower voltage from sensor

The sensor in no way measures co2

What the computer expects to see is the pre cat do some more combustion so it expects the down stream sensor after the pre cat to see less oxygen and there fore greater gradient and thus higher voltage then upstream

Besides a tired cat you could have outside air with oxygen leaking in before down stream sensor or a tired sensor

Thanks for the info/clarification
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Old 12-16-2016, 01:55 PM   #14
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So I cleared the code and went for an 8 mile drive also turned on and off the engine couple times. The code never came back on, but my exhaust did start smelling like rotten eggs. So most likely it is my catalytic
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Old 12-16-2016, 01:59 PM   #15
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No, no, no...

Thanks for the info/clarification
Sorry ment Lacquer thinner haha not just lacquer.
And drive it right away till an empty tank not letting it sit

Also would a bad cat make my engine or exhaust humm while at a certain rpm?kind of like a vibration noise? Or shake while at slow speeds below 5 or 10?
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Old 01-11-2017, 05:00 PM   #16
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So I did the lacquer thinner method and it did work! My Jeep was running smoother than ever! Even got 200 miles for the half tank of gas.
But I guess there's something causing my catalytic to go bad since the problem came back.
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Old 01-11-2017, 05:06 PM   #17
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Ok so trying to find out what's making my cat go bad....
My oil change
New spark plugs
New idle air control valve

It all started with the airbox deck plate mod.
I did use catalytic converter friendly sealer when adding the deck plate to the airbox.
I do and have had the deck plate covered for the past month and half.
My engine is still running really smooth there just isn't any power and my exhaust pipe keeps rattling on start up and when I accelerate.
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Old 01-13-2017, 02:08 PM   #18
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Hi Dean4537, do this simple and free test.

With your Jeep parked, with the break on and the engine shut off, lay under the passenger side of your jeep and kick the muffler. When kicking listen to your catalytic convert, you will most likely hear a bunch of "rocks" rattling inside. If so, thats your problem the cat is shot. I am currently dealing with a bad cat, but it hasn't pulled any codes yet and I've yet to see what the cause is. (this is the 2nd on my jeep, so it tells me that there is a problem)

Try calling Magnaflow: 1.800.990.0905 or 1.949.858.5900 available 7am-5pm PST

Best,
Ken

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