Q: Ford KA battery light on, replaced but stilll on. Car Idles very low and cuts out if not driving.

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Ford KA battery replaced, light still on, idleing low and will cut out without sufficient revs. Oxygen sensor gone since December as mechanic MOT'd without fixing! I understand this can cause worse problems should other sensors go. Could not afford to take to another mechanic, car is now risky to start in a morning as needs revs for engine to start up. I want to know if this will be an expensive fix/likely to happen again/ worth the cost? Many thanks.

My car has 78000 miles.
My car has a manual transmission.

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