Failed MOT

[Stacey1]

<div class="bbWrapper">My Mini cooper failed it's MOT because of these three things -:<br /> <ul> <li data-xf-list-type="ul">Exhaust hydrocarbon content after 2nd fast idle exceeds manufacturer's specified limits (8.2.1.2 (a))</li> <li data-xf-list-type="ul">Exhaust carbon monoxide content after 2nd fast idle exceeds manufacturer's specified limits (8.2.1.2 (a))</li> <li data-xf-list-type="ul">Exhaust emits excessive dense blue smoke during acceleration (8.2.1.2 (g))</li> </ul>I wondered if anyone could help me understand what these mean and roughly how much it would usually cost to fix?<br /> Thanks <img class="smilie smilie--emoji" alt="😊" src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f60a.png" title="Smiling face with smiling eyes :blush:" data-shortname=":blush:" loading="lazy" width="64" height="64" /></div>

 

[ToeKnee]

<div class="bbWrapper">Try a mini forum?</div>

 

[pioneercollector]

<div class="bbWrapper">You are probably better off looking on a MINI forum, these things could be explained in a generic way, however this is more than likely car specific for proper advice....?</div>

 

[pcthrillrider]

<div class="bbWrapper">hc is unburnt fuel co means the car running rich blue smoke on exceleration could be the rings or valve stem oil seals</div>

 

[DSM10000]

<div class="bbWrapper">Out of curiosity what why did you register with a Mercedes forum?</div>