Exhaust system fault

Hi,
Anyone know what component failure to do with the exhaust system could cause the emissions to go up so far the cpu wont allow the vehicle to be
driven? [This is in a 2006 renault cleo.]
cheers
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload
On 23/01/2018 21:57, Al wrote:

Catalytic converter?
--
Cheers,
Roger
  Click to see the full signature.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Lamda sensor? Some have two (or more) before and after the cat(s). But are usually fairly easy to change and should throw up a fault code.
--
*A picture may be worth a thousand words, but it uses up a thousand times more memory.

Dave Plowman snipped-for-privacy@davenoise.co.uk London SW
  Click to see the full signature.
Add pictures here
<% if( /^image/.test(type) ){ %>
<% } %>
<%-name%>
Add image file
Upload

Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here. All logos and trade names are the property of their respective owners.