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Originally Posted by ahal
The catalytic converter is an encased ceramic honeycomb through which the exhaust fumes travel ... very delicate. It is supposed to 'trap' lead particles from the fumes before they leave the car.
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There shouldn't be any lead in your petrol these days, especially if you're running a car with a catalytic converter that's set up to run on unleaded.
I still think your best course of action is to get the fault codes read somewhere as it should help to show where the problem is. Air leaks in the various vacuum pipes that connect to the fuel injector can bugger up the mixture - this is a common problem with 850s and easily and cheaply fixed. It results in the same symptom of the lambda light occasionally coming on while driving. In the short term I found that using decent quality petrol (Shell) helped.
Cheers, Ed