Just removed the rear cats on my S320

nialler

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Hi Guys

Both rear cats had shattered on my 00 S320 petrol, quite expensive to have them replaced over here in ROI (I'm looking at around €2400 ex labour) for both sides to be done so have to get the cash together. In the meantime to stop the annoying rattle sound I've had both cats cleaned out and then resealed, will this have any implications for the engine?

Looking forward to your replies.

Nialler
 

bigasotonuk

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C43/55 AMG 1999 / C230K 1997
Hi,
Don,t bother replacing them, leave the car as it is without the CATS the car should as previously said be more powerful, been thinking about doing this myself, but though i have been assured it will still pass the emissions test in the MOT, it would be expensive if it did,nt, if it was me take it to an MOT testing station and ask just for an emissions test, if it passes, keep the £2000 odd quid/euros in your pocket. Post back on the results.
Good luck
 

47p2

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W638, W140, W220, W639 All gone but not forgotten
I removed a cat from one of my diesel Mercs about 6 years ago, the best thing I ever done. The weld joint kept breaking and I had it re-welded about 6 times before deciding to remove the cat and replace it with a stainless steel section. It has never failed an emission test in the past 6 years and although I couldn't say whether it has given me more power, it certainy doesn't seem to have done the vehicle any harm
 

television

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On the v6 petrol cars with the upper and lower cats it work very well taking out the lower ones,, they all pass the test with no problems
 

kth286

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E320 Coupe 95
You only have those two cats - one in each branch.

The other boxes are the additional exhaust insulation to keep the gases hot for when they get to the cats, so as to be more effective, quicker.

You have the o2 sensor before each cat and you have the diagnostic sensor after each cat .

You now have the situation that the 'after cat' sensors will be recording ineffective cats.

Put it on 'star' and see what comes up.
 

panason1c

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Mercedes ML270CDI, VW Polo 1.9tdi, BMW K1200RS
No damage will occur to the engine.......As for mot implications, Just go to any mot equipped garage and pay for a cat test only........15 minutes labour charge?...........possibly free if you take him a can of guinness..... (-:
 
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nialler

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Thanks guys, a little bit more reassured now, even though spoke to my engineery type guy who's in a main dealer said it wouldn't be a problem (other than emissions test) I bow to your superior knowledge, thanks again, love the car and look after her but this one's a bit over the top.
 

LYNALL

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Do a search as im sure this has been covered before you have 2 cats per bank ie 4 in total the lambda sensors only measure the front cats and not the rear ones that you have gutted so you should get no fault codes up.

My wifes w203 has 4 cats same engine as yours and my w210 also has 4 cats.

Lynall
 

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television

Always remembered RIP
Joined
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Your Mercedes
2002 SL500, 216 CL500, all fully loaded
Do a search as im sure this has been covered before you have 2 cats per bank ie 4 in total the lambda sensors only measure the front cats and not the rear ones that you have gutted so you should get no fault codes up.

My wifes w203 has 4 cats same engine as yours and my w210 also has 4 cats.

Lynall

Yes that is the same as the V6 in the 129 and the upper CATs seldom or never fail
 
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nialler

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You only have those two cats - one in each branch.

The other boxes are the additional exhaust insulation to keep the gases hot for when they get to the cats, so as to be more effective, quicker.

You have the o2 sensor before each cat and you have the diagnostic sensor after each cat .

You now have the situation that the 'after cat' sensors will be recording ineffective cats.

Put it on 'star' and see what comes up.

Hi KTH

If you look at parts 10 & 30 in Lynall's picture you'll see the front and rear CATs on each front pipe, unfortunately MB sell the entire pipe rather than the individual CATs hence the exhorbitant cost, further investigating and pricing has been cheapest at €125 per cat excluding fitting and the guy that cleaned them out has quoted €250 (american imported cats) that includes fitting per cat, so I'll wait for the cheques to arrive at the end of the month and see how I get on.

N
 

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