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Lambda Sond warning lamp on - problem? ALL

When I started my 1991 940's engine this morning the lambda sond lamp was (and stayed) on, but the engine otherwise seems as smooth as ever.

It has a European F230FB engine with 158,000 km (just under 100,000 miles).

What could it be? Is this something I should rush to the dealership for or is there nothing that can go terribly wrong?

TIA

Rob






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