Please Help ! Running Problem

[Callum Hill]

So, i have a problem just brought a 53 plate seat Leon Cupra but it has a problem from cold i plugged in my draper diagnostic tool in as engine light was on two codes where in there one for air flow meter and one for lamba sensor so last weekend i replaced the air flow mass sensor and re-set codes and light went out but carried on running **** now the light is back on and still reving up and down on cold start any common problems with these engines i was thinking next stage either:

- Temp sensor ) previous owner said it had one last year)
- Check for leaks
- Idle controll Valve
- Thottle body

Can Anyone help!!!

 

[towcester vag]

what code have you got now?
i would suspect you need to clean and reset throttle body

 

[Callum Hill]

how do i reset it and have code for lamba sensor !