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Post by jakewb33 on Jul 21, 2014 19:35:47 GMT -5
Hey guys I've got a 2001 MS XLS with 144,000 miles. Just recently the exhaust has this rattling sound as I accelerate through every gear. At first I was thinking It was just some get shielding but now I think it's coming from one or both of the catalytics. Do CATS rattle when they go bad? Also now my SES light is on and the code is for an O2 sensor. What's are good quality cats to purchase if needed? Has this noise happened to anyone else?
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Post by youngblood on Jul 24, 2014 8:06:07 GMT -5
I have a similar issue, I found its a heat shield on top of the right bank cat converter, its loose and makes a rattling sound, as far as catalytic go I believe you have to use the mitsu oem ones or you will have trouble with the computer module. My 01 MS is giving code for booth banks catalytic but to replace the oem ones is a small fortune and is yours a California model or not? Perhaps we can get some other experienced members to chime in on this.
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Post by jakewb33 on Jul 25, 2014 9:19:42 GMT -5
Oh I always thought it was heat shielding but couldn't find it, that's a relief. Although I still need to replace at least one cat. No I do not live in California...thank God for that.
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Post by li99ms on Jul 30, 2014 15:07:08 GMT -5
Hey I just got a SES light that came on and its only the PO420. I'm going to think it is only the O2 sensor cause the exhaust is fine and the MS is so quiet I almost wouldn't know its on....Do they just go bad? I also found a replacement online for 30 bucks or do I need to get it from the dealer? And I live in New York
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Post by buggzyy on Jul 31, 2014 0:44:05 GMT -5
Those of you who have a fault code p0420 or p0430 your pcm had detected a faulty catalyst. this means the cat converter is not working properly. Some will say you can clean them and some will argue that wont work. Either way one or both cats will need replacement. A p0420 is for bank 1 which is the RH side and the 430 is for the LH side. this code doesn't mean the O2 sensor is bad actually just the opposite they are working just fine and have detected a faulty cat. I have used A/M cats from RockAuto and have had to cut and weld because the fit just wasn't correct This is fine if you can do that kind of work but for proper fit I would suggest OE. The After market cats passed the emission's test and have not set a fault and have been in use for over a year. Also about the California and New York restrictions This means the company cannot sell their cats to addresses in those states because their products have not been approved its basically the same cat nothing is different as far as I know. Hope this answers some of your questions.
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Post by youngblood on Jul 31, 2014 11:02:33 GMT -5
When you used the aftermarket cats from Rockauto, you said the fit wasn't exact, I am thinking of getting the left and right cat from them for my 01 MS but what kind of cutting is involved? I can not afford the OE ones.,Thanks
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Post by buggzyy on Aug 2, 2014 1:32:25 GMT -5
The LH cat the pipe wasnt bent properly to clear the trans bell housing the RH cat the pipe was too short to make to the center pipe. The LH cat I just cut the cat out and welded it to the old pipe, the RH cat I just bought a 4 dollar piece of pipe and extended the pipe a few inches. Oh and the flange was wrong I double checked the Year make and model and I selected the correct one but the stuff didn't fit right it even said direct fit. over all not too bad if you have a welder and sawzall
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Post by youngblood on Aug 2, 2014 6:23:01 GMT -5
Thank you buggzyy for the info, I thought the cats had to be OE due to the PCM having issues with non OE cats, well I'm glad to here that. my buddy has a auto repair shop so the welding and cutting won't be an issue , guess I would order the flange gasket from the dealer.
jakewb33 I apologize I thought the cats had to be 100% OE but buggzyy proved they don't which is good for all of us.
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Post by jakewb33 on Aug 2, 2014 13:56:32 GMT -5
No problem and that's good to know. But it turns out that the rattling noise that im hearing seems to just be the resignator before the muffler. It's all rusted and falling apart. Do you think this could cause the O2 sensor to trip an SES code?
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Post by buggzyy on Aug 3, 2014 2:21:00 GMT -5
jakewb33 It is very unlikely your failing resonator is causing a ses lamp. the PCM doesn't monitor this part.
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Post by jakewb33 on Aug 3, 2014 9:57:27 GMT -5
Well then im hoping that the rattling is being caused by the resignator which seems very likely and im hoping that the O2 sensor just needs to be replaced? Either way I've got some work to do.
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