Q: WHy did my cats fail?

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SteveB - 18 Apr 2004 13:26 GMT

Hi all - I have a 1998 540i V8. I've only had it 6 weeks but in that time
both cats have failed (still subject to legal dispute). A week before cat
failure, BMW Dundee found that the thermostat (MAP thermostat?) and the
radiator both needed replacing. Could the thermostat have been involved
with the cat failure? I read on a website (can't find it!!) that the
thermostat could cause cats to fail. The reason I ask is that I'm hoping to
eliminate anything that may cause them to fail again

cheers
Steve

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Fred W. - 18 Apr 2004 13:27 GMT

> Hi all - I have a 1998 540i V8. I've only had it 6 weeks but in that time
> both cats have failed (still subject to legal dispute). A week before cat
[quoted text clipped - 3 lines]
> thermostat could cause cats to fail. The reason I ask is that I'm hoping to
> eliminate anything that may cause them to fail again

Possible. If the engine was running too cold all of the time it would also
be running rich. Spewing a lot of unburnt fuel into the cats would be one
way to toast them.

-Fred W

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JP Roberts - 21 Apr 2004 12:54 GMT

Overfilling the oil pan.

> Hi all - I have a 1998 540i V8. I've only had it 6 weeks but in that time
> both cats have failed (still subject to legal dispute). A week before cat
[quoted text clipped - 6 lines]
> cheers
> Steve

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