Lazy starting?

[charge]

I was suffering from lazy starting after leaving the car for a few days so ordered a new battery from eurocar parts. To cut a long story short the battery they supplied was dud so I put my original one back on, and the car isn't happy. It now has ESP light and air suspension warning light on when you start it which goes away when you drive it, but comes back on a soon as you take a tight turn. The dealer thought it was the steering pos. sensor or needed a full alinement (£450) but wasn't realy sure. Before I lay out the thick end of £1k till they replace a bit that fixes it ( or go the whole hog and tell me the ECU is fried) anyone have advice please?

[Cupramax]

Telling us what car you have might be a help...

[Tame Technician]

I'm guessing Diesel allroad????

Check the alternator belt, that battery is clearly low. The warning are things shutting off as the voltage drops out.

But the fact that you get a battery voltage drop off when you turn, PAS use, suggests maybe somthing wrong with the belts.