Hello all, me again. Back to pick the collective brain. Today the present Mrs C. took her 2004 manual Gen 2 CR-V out and within a mile the orange engine warning light came on. She limped it home and I've had a look but aside from the coolant seeming a bit low in the expansion tank, there's nothing obvious. She said the engine heated up quite quickly. I've topped up the coolant and run the engine for a minute but the orange light stayed on. She had Googled the problem and discovered it could be a loose petrol cap so she checked that. Is that true? Seems a bit daft to me when the filler cap isn't part of the engine but I live to learn so .... Anything I can check or try? Remember I'm a relative simpleton but I'll give most things a go. Gratitude as always.