slk catalytic converter failure - Mercedes Benz SLK Forum

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#1 Old 09-06-2009
 
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slk catalytic converter failure

Hi guys, I have a SLK 2005 350 and at 9900 miles both cats need replacing. They went at 3 years 11 months, and MB are only offering 22% off a £1,500 repair bill. I've tried to get them to increase their offer, but even giong to the very top of the organisation has not done any good.
I've had plenty of support from people who are in the trade who find it extrordinary they went, and on the miserly reduction they are offering to replace them. I had a full Mercedes Benz service record at the time the fault light indicated failure, which has been exhaustively researched and they really have failed.
Any ideas welcome,

Last edited by Robert Longley; 09-06-2009 at 04:58 PM. Reason: spelling errors
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#2 Old 09-06-2009
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Hi Robert, welcome from NE England. JB will be along shortly asking to fill out your full user profile because many answers to questions are country specific. For example, if you were from the UK, your SLK would be covered for 6 years, under the 1979 Sale of Goods Act - your claim being against the dealer you bought it from, not MB directly.






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#3 Old 09-06-2009
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Never heard of this on any MB forum. Do they have any idea what caused the failure of both cats at the same time? I understand that over filling the oil can damage the cats or possibly some type of fuel contamination?
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#4 Old 09-06-2009
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Same here - never heard of any cat problems on any SLK's...

From the 'tubes :

Quote:
Catalytic converter failures typically fall into one of four categories:
1. Thermal failure (overheating)
2. Plugged substrate
3. Thermal shock
4. Physical damage
Thermal failure is most often caused when excessive raw fuel comes into contact with the catalyst, and "burns" in the converter instead of in the engine. The high quantity of fuel generates temperatures well in excess of the capacity of the converter, causing meltdown of the ceramic monolith. The melted ceramic could block the exhaust path, leading to a significant loss of engine power. Visible symptoms include heat-related discoloration of the converter shell.
Potential causes of thermal failure include: misfire, malfunctioning oxygen sensor, fuel delivery issue, improper choke setting/operation, and ECU malfunction.
A plugged or contaminated substrate can be the result of an overly rich air/fuel mixture, radiator sealant, and oil or antifreeze entering the exhaust flow. The resultant carbon deposits restrict the operation - and ultimately the flow characteristics - of the converter by coating the unit's reactive surface. This degrades the converter's ability to perform its chemical conversion process, leading to potentially illegal levels of HC, CO, and NOx.
Root causes of this problem are a malfunctioning O2 sensor, plugged or inoperable fuel injectors, piston blow-by, leaking head gasket, broken or frozen choke or carburetor float, excessive cranking time, and repeated incidences of running out of gas.
Thermal shock occurs when a fully heated converter suddenly is "cold-quenched," such as coming into contact with snqw or ice. This leads to sudden contraction of the converter housing, which can cause cracks and disintegration of the ceramic substrate. Symptoms include a "rattling'' sound when the converter is tapped with a fist or mallet (monolith-type converters only).
Physical damage, caused by running over road debris, collisions and other impacts, is usually easy to diagnose. This type of damage can break up the ceramic substrate or cause restriction that changes the flow characteristics of the converter or impacts the efficiency of the catalyst.


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#5 Old 09-06-2009
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Welcome from Valrico, Florida!
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#6 Old 09-07-2009
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Mate I have got the tier 1 extended warranty and Merc wouldnt even cover an O ring failure in my a/c pipe. Like you I went all through the customer no service route etc etc. In the end they won because I just dont have enough time or inclination to keep at it and go through the ombudsman and so on and so forth. I guess this is what they rely on.
FWIW I was treated much worse in 2002 when the cars were unreliable, at least the car is half decent these days. None compare to my R129 quality though.
Specialists and no warranty all the way.
Im afraid you will get nowhere unless your prepared to go litigation.
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#7 Old 09-08-2009
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Quote:
Originally Posted by Robert Longley View Post
Hi guys, I have a SLK 2005 350 and at 9900 miles both cats need replacing. They went at 3 years 11 months, and MB are only offering 22% off a £1,500 repair bill. I've tried to get them to increase their offer, but even giong to the very top of the organisation has not done any good.
I've had plenty of support from people who are in the trade who find it extrordinary they went, and on the miserly reduction they are offering to replace them. I had a full Mercedes Benz service record at the time the fault light indicated failure, which has been exhaustively researched and they really have failed.
Any ideas welcome,
I actually have my stock 2005 SLK cats in storage but I imagine they'd cost an arm and leg in shipping costs from the U.S. to the U.K.
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#8 Old 09-08-2009
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Robert, James, talk, decide if you want the cats in the UK and can do a deal.

If so, you'll need to send me the weight, and Robert the price shipped to Louisiana (70726). Robert you'll need to cover shipping from James to Louisiana, and then my costs from E14 to where ever you want 'em to end up. Assuming they don't fundamentally impact my container weight, international bit is on me.

They *must* be in Louisiana by Sept 28th. Expect 'em to be in your hands by mid October-ish. Need to be a little bit flexible, as while I know when the shipment leaves LA, I don't know exactly what date I'll be back in the UK to accept it, but would be no later than 30 October.



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#9 Old 09-12-2009
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Cats are a known slk problem?!?

One of mine went during the fifth year of its life. They had to replace the whole section from collectors (manifolds?), i.e. the attached pic.

Just the part cost 1300 Euros, then add labour and other extras. From what I am reading in the Spanish forums, it has happended to a lot of us with our SLKs, could this be another weak point?!
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