Apologies for the length, I’d rather give too much info. Diesel Fiat 500L 2013. Took for a service knowing it had a defective near side DRL. This was replaced, however, when coming off the ramp the offside went, replaced and working. Next day a warning light appears. I return to the garage and they replace the bulb.
Now my problem. The DRL are both on when the ring nut is turned to O and when the dusk sensor is activated. However, when the ring nut is turned to headlight the off side DRL goes out and the warning light appears.
Advice gratefully appreciated.