Yellow engine warning light - Help !

[Scooba_Steve]

You either need to pay someone to read the current code and stored code(s) or buy a cable and do it yourself.
Anything else is fumbling around in the dark and a waste of time and money as this could be a different fault. I think your best bet, long term, is to buy the kit for yourself.

 

[kowsmou]

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[kowsmou]

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[Scooba_Steve]

Once it goes back into spec it will clear. I don't think cataclean or similar actually work. I'm not sure what the cat failure rates are but expect them to be lower than the sensors. Trouble is the post cat are a pain to change, if it doesn't affect drivability then I'd not be too worried, can you clear the code using your reader?

 

[markalp]

I would be tempted to pop in quality fuel, and then drive her hard for a good few miles. Clear out the built up crud etc.