C-Class (W203) 2001-2007, C160, C180, C200, C220, C230, C240, C270, C280, C300, C320, C230K, C350, Coupe

c240's catalytic converter

Thread Tools
 
Search this Thread
 
Rate Thread
 
Old Jul 23, 2010 | 04:31 PM
  #1  
sinaa's Avatar
Thread Starter
Member
 
Joined: Jun 2009
Posts: 77
Likes: 0
C240
c240's catalytic converter

hi everyone

i need some help regarding my catalytic converters, about 2 years ago my OEM catalytic converters broke so i took the car to mb dealership and got it replaced for about $2300 both sides a year later they broke again so i thought there might be a misfire or somthing i took the car to the dealership and got them to check to see if there is anything wrong with the engin or misfire and they told me there is nothing wrong cost to fix $2500 this time, so i said f**k it took the car to an exhasut shop and got magnaflow's catalytic converters now its broken again yesterday i took the car to a different mb and they checked and told me there is nothing wrong with my engin and both cats need to be replaced.
anyways im really tired of this issue, and dont have the budget to get OEM cats . i wonder if anyone has any suggestion or anything, i was thinking of going with stright pipe, but i dont wanna pollut the air and sound like 16 years old kid who drives a 90 civic with magnaflow on it here is a picture of her
c240's catalytic converter-dsc02354.jpg
Reply
Old Jul 23, 2010 | 06:19 PM
  #2  
Glyn M Ruck's Avatar
Super Moderator
MBWorld Ambassador

 
Joined: Jun 2008
Posts: 19,942
Likes: 192
From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
The big question here is why do you keep suffering Cat failure. This is not normal. Do you drive fast over speed bumps or similar with hot exhausts? The biggest killer of Cats is driving over harsh bumps while the honeycomb is incandescent in the Cats.
Reply
Old Jul 23, 2010 | 11:55 PM
  #3  
sinaa's Avatar
Thread Starter
Member
 
Joined: Jun 2009
Posts: 77
Likes: 0
C240
Originally Posted by Glyn M Ruck
The big question here is why do you keep suffering Cat failure. This is not normal. Do you drive fast over speed bumps or similar with hot exhausts? The biggest killer of Cats is driving over harsh bumps while the honeycomb is incandescent in the Cats.
Glyn to be honest i dont drive fast over speed bumps, and l i always use clean 94 oc gas i dont know whats wrong with it
glyn for my own info what are the pros and cons of going stright pipe, am i gonna get CEL? poor gas milage? any good aftermarket brand cat for w203?
Reply
Old Jul 24, 2010 | 10:45 AM
  #4  
londonbenzkid's Avatar
Member
 
Joined: May 2009
Posts: 102
Likes: 0
From: London, Ontario, Canada
2002 C240, 2006 ML350, 2011 X3
how much did it cost for the magnaflow cats with install?
Reply
Old Jul 24, 2010 | 09:42 PM
  #5  
Glyn M Ruck's Avatar
Super Moderator
MBWorld Ambassador

 
Joined: Jun 2008
Posts: 19,942
Likes: 192
From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
You can remove the so called secondary Cats - if you remove the primary units you will have a perpetual message on dash from the post cat O2 sensors that Cat function is sub standard.
You will fail emission tests. I'm not a fan of aftermarket Cat's.
Reply
Old Jul 24, 2010 | 09:46 PM
  #6  
sinaa's Avatar
Thread Starter
Member
 
Joined: Jun 2009
Posts: 77
Likes: 0
C240
Originally Posted by londonbenzkid
how much did it cost for the magnaflow cats with install?
i paid $400 for magna flow H-D cats
Reply
Old Jul 25, 2010 | 12:12 AM
  #7  
londonbenzkid's Avatar
Member
 
Joined: May 2009
Posts: 102
Likes: 0
From: London, Ontario, Canada
2002 C240, 2006 ML350, 2011 X3
thanks for the price
I am also having similar problems, i had it fixed and now it is rattling again
Reply
Old Jul 25, 2010 | 09:50 AM
  #8  
sinaa's Avatar
Thread Starter
Member
 
Joined: Jun 2009
Posts: 77
Likes: 0
C240
Originally Posted by londonbenzkid
thanks for the price
I am also having similar problems, i had it fixed and now it is rattling again
np, so what are you planing to do? going aftermarket?
Reply
MB World Stories

The Best of Mercedes & AMG

story-0

6 Mercedes Models That Did NOT Age Well (But Are Somehow Still Cool)

 Verdad Gallardo
story-1

Manual Mercedes? 6 Times Sindelfingen Let Drivers Have All The Fun

 Verdad Gallardo
story-2

Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren

 Verdad Gallardo
story-3

8 Classic Boxy Mercedes Designs That Have Aged Like Fine Wine

 Verdad Gallardo
story-4

Flawlessly Restored Mercedes 190E Evo II Heads to Auction

 Verdad Gallardo
story-5

Electric Mercedes C-Class Unveiled: 11 Things You Need to Know

 Verdad Gallardo
story-6

Mercedes EQS Gets A Major Update: Everything You Need to Know

 Verdad Gallardo
story-7

5 Underrated Mercedes-Benz Models That Don't Get the Love They Deserve

 Verdad Gallardo
story-8

Mercedes 300D Has Pushed Well Past 1 Million Miles and It Ain't Stopping

 Verdad Gallardo
story-9

10 Most Reliable Mercedes-Benz Models You Can Buy Used

 Verdad Gallardo
Old Jul 25, 2010 | 10:22 AM
  #9  
W203E35's Avatar
MBWorld Fanatic!
 
Joined: Feb 2009
Posts: 5,537
Likes: 8
2006 C350 Sport 6MT
Are you getting any messages or check engine? From my understanding you just have noise coming from the cat because something is broken inside?

If you are not getting any messages and check engine lights then maybe you can go to an exhaust shop and have them cut open the cat and remove the broken honey comb. 2200 seems very expensive and I honestly wonldn't change the cat unless the cat has gotten poisoned.

This is how the honey comb looks and it can easily break.
http://upload.wikimedia.org/wikipedi..._structure.jpg

Replacing a pipe instead of the Cat won't make your car too loud. I think the only problem you'll have is if you need to pass emissions and a check engine light.

If you are financially not ready then replacing the cat with a pipe might be the best choice for now.
..until you finish school and have enough income for another cat replacement)
Reply
Old Jul 25, 2010 | 10:34 AM
  #10  
sinaa's Avatar
Thread Starter
Member
 
Joined: Jun 2009
Posts: 77
Likes: 0
C240
thanks for your quick reply karo
yes the stuff in that honey comb is broken and make rattling noise and i dont know its just me or wat, i feel a lil underpowered & car shakes abit since they are broken. i spended over $2700 on these stupid cats which i couldve spended on mods (amg body kit)is there any way to not to get engin light?
Reply
Old Jul 25, 2010 | 10:36 AM
  #11  
sinaa's Avatar
Thread Starter
Member
 
Joined: Jun 2009
Posts: 77
Likes: 0
C240
Originally Posted by Karo
Are you getting any messages or check engine? From my understanding you just have noise coming from the cat because something is broken inside?

If you are not getting any messages and check engine lights then maybe you can go to an exhaust shop and have them cut open the cat and remove the broken honey comb. 2200 seems very expensive and I honestly wonldn't change the cat unless the cat has gotten poisoned.

This is how the honey comb looks and it can easily break.
http://upload.wikimedia.org/wikipedi..._structure.jpg

Replacing a pipe instead of the Cat won't make your car too loud. I think the only problem you'll have is if you need to pass emissions and a check engine light.

If you are financially not ready then replacing the cat with a pipe might be the best choice for now...until you finish school and have enough income for another cat replacement)
no im not getting any messages or anything right just the noise
Reply
Old Jul 25, 2010 | 10:49 AM
  #12  
W203E35's Avatar
MBWorld Fanatic!
 
Joined: Feb 2009
Posts: 5,537
Likes: 8
2006 C350 Sport 6MT
Originally Posted by sinaa
no im not getting any messages or anything right just the noise
Go to a muffler shop and ask them if they will be able to cut the cat open and remove the broken honey comb.

If that doesn't work then you might have to remove cats and replace with a pipe. Your car might sound a little louder and you will get check engine light. I believe a tuning shop will be able to go into the ECU and disable the warning.

Or you can just drive around with the check engine light on but if you get another check engine (something serious) you might not notice because of the already check engine light on.

Try to see if the muffler shop can cut the cat open first.

Also I have no idea why the car would be shaking and loss of power. It might be your mind playing a trick on you? When I detail my car for some reason the car feels like it responds better and drives better (mind playing a trick on me)
Reply
Old Jul 25, 2010 | 10:54 AM
  #13  
W203E35's Avatar
MBWorld Fanatic!
 
Joined: Feb 2009
Posts: 5,537
Likes: 8
2006 C350 Sport 6MT
The loss of power and shaking can be that the broken cat (honey comb) has clogged and air doesn't pass freely.

My only guess...hope my info help
Reply
Old Jul 25, 2010 | 10:59 AM
  #14  
W203E35's Avatar
MBWorld Fanatic!
 
Joined: Feb 2009
Posts: 5,537
Likes: 8
2006 C350 Sport 6MT
Air passes freely





Since honey comb broke it can clog the holes and air doesn't pass freely anymore causing loss in power and/or even shaking




When a converter becomes clogged with debris or are broken, the engine has to work much harder to accelerate and idle because the exhaust pressure is backing up in the pipe. This causes a highly erratic idle and or stalling and little or no power on acceleration, as well as higher engine temperatures. In this case the shaking described may be strong idle.





Last edited by W203E35; Jul 27, 2010 at 10:52 PM.
Reply
Old Jul 25, 2010 | 11:02 AM
  #15  
londonbenzkid's Avatar
Member
 
Joined: May 2009
Posts: 102
Likes: 0
From: London, Ontario, Canada
2002 C240, 2006 ML350, 2011 X3
Originally Posted by sinaa
np, so what are you planing to do? going aftermarket?
not sure, might try out karo's idea since it would be cheapest
Reply
Old Aug 4, 2010 | 10:24 PM
  #16  
londonbenzkid's Avatar
Member
 
Joined: May 2009
Posts: 102
Likes: 0
From: London, Ontario, Canada
2002 C240, 2006 ML350, 2011 X3
Hi Sinaa, quick question: The Magnaflow Cats, did they ever give you an error message?
Reply
Old Aug 5, 2010 | 01:00 AM
  #17  
sinaa's Avatar
Thread Starter
Member
 
Joined: Jun 2009
Posts: 77
Likes: 0
C240
Originally Posted by londonbenzkid
Hi Sinaa, quick question: The Magnaflow Cats, did they ever give you an error message?
no error but my suggestion to you is go OEM, magnaflow wont last long, this time i got OEM +7 years warranty
Reply
Old Aug 5, 2010 | 05:42 AM
  #18  
Glyn M Ruck's Avatar
Super Moderator
MBWorld Ambassador

 
Joined: Jun 2008
Posts: 19,942
Likes: 192
From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
+1
Reply
Old Aug 5, 2010 | 11:04 AM
  #19  
londonbenzkid's Avatar
Member
 
Joined: May 2009
Posts: 102
Likes: 0
From: London, Ontario, Canada
2002 C240, 2006 ML350, 2011 X3
Ok thanks, I will try to get the shop to just cut and fix the cat like Karo said. If not.... I will have to shell out the cash for oem
Reply
Old Aug 5, 2010 | 11:22 AM
  #20  
Wardsweb's Avatar
Senior Member
 
Joined: Mar 2003
Posts: 448
Likes: 4
From: San Antonio, TX
'11 SL550 - '08 ML350
The dealer has replaced the cats on my '03 twice under warranty. I was told this was a known defect. Your mileage may vary.
Reply
Old Aug 5, 2010 | 11:25 AM
  #21  
londonbenzkid's Avatar
Member
 
Joined: May 2009
Posts: 102
Likes: 0
From: London, Ontario, Canada
2002 C240, 2006 ML350, 2011 X3
i asked a while back and they told me I was out of the emissions warranty. Which I think I was by a year
Reply
Old Aug 5, 2010 | 12:02 PM
  #22  
tommy's Avatar
Out Of Control!!
 
Joined: Nov 2001
Posts: 10,067
Likes: 11
From: Westwood, NJ
2004 Civic Si. FWD for the Win!
Originally Posted by sinaa
no error but my suggestion to you is go OEM, magnaflow wont last long,
That's misinformation. There's nothing magical about the OEM cats, other than how wide open your a$$ is after the dealer reams you. I've had a Magnaflow on my car for about 5 years now, if memory serves. Get P0420 every so often, but it clears and takes at least several months to come back. For the price difference of one cat of about $11-1200, it's an inconvenience that I think most people could live with.
Reply
Old Aug 5, 2010 | 12:41 PM
  #23  
Glyn M Ruck's Avatar
Super Moderator
MBWorld Ambassador

 
Joined: Jun 2008
Posts: 19,942
Likes: 192
From: Llandudno, Cape Town, South Africa
late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires
Cheap Aussie!
Reply
Old Aug 5, 2010 | 01:14 PM
  #24  
tommy's Avatar
Out Of Control!!
 
Joined: Nov 2001
Posts: 10,067
Likes: 11
From: Westwood, NJ
2004 Civic Si. FWD for the Win!
Originally Posted by Glyn M Ruck
Cheap Aussie!
Damn straight.

Oilcans of Foster's aren't cheap, you know.
Reply
Old Nov 1, 2012 | 07:44 PM
  #25  
tygar1963333333's Avatar
Newbie
 
Joined: Nov 2012
Posts: 1
Likes: 0
2003 C240
2003 c240

I have rattling coming from my c240, plus a recent loss of power and my check engine light comes on. I have reset it but on acceleration it comes back on, I barely mad it up the hill to my house. Do you think this is a sign my cat core might be clogging exhaust flow and cuasing my loss of power. This is a new vehicle to me and has been freshly tuned up?
Reply


You have already rated this thread Rating: Thread Rating: 0 votes,  average.


All times are GMT -4. The time now is 06:40 AM.

story-0
6 Mercedes Models That Did NOT Age Well (But Are Somehow Still Cool)

Slideshow: Not every Mercedes design becomes timeless, some feel stuck in the era they came from.

By Verdad Gallardo | 2026-05-12 18:09:07


VIEW MORE
story-1
Manual Mercedes? 6 Times Sindelfingen Let Drivers Have All The Fun

Slideshow: Yes, Mercedes built manual cars, and some of them are far more interesting than you'd expect.

By Verdad Gallardo | 2026-05-02 12:36:58


VIEW MORE
story-2
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren

Slideshow: A one-of-one U.S.-spec Mercedes-Benz SLR McLaren Roadster became even rarer after a factory-backed transformation at McLaren's headquarters.

By Verdad Gallardo | 2026-04-29 11:19:28


VIEW MORE
story-3
8 Classic Boxy Mercedes Designs That Have Aged Like Fine Wine

Slideshow: Before curves took over, Mercedes mastered the art of the straight line, and some of those shapes still look right today.

By Verdad Gallardo | 2026-04-25 12:05:49


VIEW MORE
story-4
Flawlessly Restored Mercedes 190E Evo II Heads to Auction

Slideshow: The 190E Evolution II shows how a homologation necessity became a six-figure collector icon.

By Verdad Gallardo | 2026-04-22 17:53:47


VIEW MORE
story-5
Electric Mercedes C-Class Unveiled: 11 Things You Need to Know

Slideshow: Mercedes is turning one of its core nameplates electric, and the details show just how serious this shift is.

By Verdad Gallardo | 2026-04-21 13:58:06


VIEW MORE
story-6
Mercedes EQS Gets A Major Update: Everything You Need to Know

Slideshow: Faster charging, longer range, and a controversial steer-by-wire system define the latest evolution of Mercedes-Benz EQS.

By Verdad Gallardo | 2026-04-15 10:35:34


VIEW MORE
story-7
5 Underrated Mercedes-Benz Models That Don't Get the Love They Deserve

Slideshow: These overlooked Mercedes-Benz models never got the spotlight, but they quietly delivered more than most remember.

By Verdad Gallardo | 2026-04-13 19:35:45


VIEW MORE
story-8
Mercedes 300D Has Pushed Well Past 1 Million Miles and It Ain't Stopping

Slideshow: A well-used 1991 Mercedes-Benz 300D with more than one million miles is now looking for a new owner, and it still appears ready for more.

By Verdad Gallardo | 2026-04-10 10:05:15


VIEW MORE
story-9
10 Most Reliable Mercedes-Benz Models You Can Buy Used

Slideshow: From bulletproof sedans to surprisingly tough SUVs, these Mercedes models proved that the three-pointed star can go the distance.

By Verdad Gallardo | 2026-04-08 09:55:49


VIEW MORE