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Catalytic converter question - permanent engine damage?

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Old 01-07-2011, 11:39 PM
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Catalytic converter question - permanent engine damage?

I have a 2000 ML320 (original owner!) with 155,000 miles. Left for skiing road trip. After an hour, "check engine" light comes on. Stopped at MB dealer. Says catalytic converter needs to be replaced ($1300 + $300 labor). Asked if OK to drive rest of trip (250 miles) and repair next week. He says yes. Drive another hundred miles, and check engine light comes on... then loss of power. Pulled over. Turned off engine, waited five minutes, then restarted. Drove about a mile then same issue. Turned around and tried to drive back. Made it three miles and car gave up.

1 - What are chances I have permanently damaged engine?
2 - If I replace cat, will I likely be OK?
3 - Anyone had success using non-OEM parts such as from eBay?

I am, of course, in the middle of nowhere in a town of 14,000 people (better than being on side of road, I guess). Thank you for your advice.
Old 01-08-2011, 02:54 AM
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Originally Posted by lonwelsh
1 - What are chances I have permanently damaged engine?
2 - If I replace cat, will I likely be OK?

1) I doubt that your engine is damaged because of the CAT problem.
2) I think you should be Ok after replace with a new CAT. My guess the reason why your car would run anymore because of the CAT break apart inside and clogged up the exhaust.
Old 01-12-2011, 09:13 PM
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I had the same symptoms on my 98 ML320 with 183K miles. Replaced the plugs and wires. Didn't help.

Replaced the Mass Air Sensor. Didn't help.

Replaced both Driver side and Passenger Side Catalytic Converters for $1500. It works.

In addition to the $1500 the above stuff cost me $1200 along with all new hoses and belts. I want 250K miles out of this car and haven't had a car payment since 2003 so it was well worth it.
Old 01-13-2011, 10:06 AM
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Originally Posted by lonwelsh
I have a 2000 ML320 (original owner!) with 155,000 miles. Left for skiing road trip. After an hour, "check engine" light comes on. Stopped at MB dealer. Says catalytic converter needs to be replaced ($1300 + $300 labor). Asked if OK to drive rest of trip (250 miles) and repair next week. He says yes. Drive another hundred miles, and check engine light comes on... then loss of power. Pulled over. Turned off engine, waited five minutes, then restarted. Drove about a mile then same issue. Turned around and tried to drive back. Made it three miles and car gave up.

1 - What are chances I have permanently damaged engine?
2 - If I replace cat, will I likely be OK?
3 - Anyone had success using non-OEM parts such as from eBay?

I am, of course, in the middle of nowhere in a town of 14,000 people (better than being on side of road, I guess). Thank you for your advice.
Unlikely but possible engine damage (burned valves, other overheat high cyl temp damage)

Likely be OK if all Cats are replaced

Some non OEM are OK but the OEM is the way to go. E Bay is NOT a credable source of MB parts.
Old 01-15-2011, 12:42 PM
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Check the Crank Sensor
Old 02-11-2011, 08:37 PM
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Was the welds on the cats cracked? While running was it loud? If it was it should be under warranty 8/80k. Oh and btw change your tranny fluid!!!!!
Old 02-11-2011, 09:36 PM
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The cat/cats will need to be replaced. The catalytic converter is clogged and the back pressure from the exhaust will stall the engine. If you are stuck you just need to wait until the pressure goes back down. As for the motor should be alright.
Old 04-17-2012, 04:25 PM
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Originally Posted by lonwelsh
I have a 2000 ML320 (original owner!) with 155,000 miles. Left for skiing road trip. After an hour, "check engine" light comes on. Stopped at MB dealer. Says catalytic converter needs to be replaced ($1300 + $300 labor). Asked if OK to drive rest of trip (250 miles) and repair next week. He says yes. Drive another hundred miles, and check engine light comes on... then loss of power. Pulled over. Turned off engine, waited five minutes, then restarted. Drove about a mile then same issue. Turned around and tried to drive back. Made it three miles and car gave up.

1 - What are chances I have permanently damaged engine?
2 - If I replace cat, will I likely be OK?
3 - Anyone had success using non-OEM parts such as from eBay?

I am, of course, in the middle of nowhere in a town of 14,000 people (better than being on side of road, I guess). Thank you for your advice.
I had the same problem, replaced CAT for $1,200 - problem fixed.

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