V70 2005 D5 euro3 Emissions Warning
 

Just had an emissions warning light come up on my D5 (which has no DPF)
I don't have a code scanner. What kind of thing might cause this?
thanks in advance

Hello there , my first thought would be the EGR valve . These get covered in oily soot that builds up & can cause the valve to not cycle through its full range of movement . This can lead to loss of boost , incorrect fuelling and fouling of oxygen sensors in exhaust . Try & find a local indie who can read the codes . Does not need to be genuine Volvo , Snap-on / Launch or Autel are certainly up to the job .

Codes will lead you where you need to go & avoid wandering around aimlessly ,chucking money at the issue