Hi Firstly I would like to welcome everyone as it's my first post. I hope someone would point me in the right direction. The car is Ibiza 1.2 12V with 77k miles So today my car failed badly ( i think ) with readings of: Fast idle test: CO max 0.30% had 0.51% FAIL HC max 200ppm had 33ppm PASS Lambda 0.97-1.03 had 0.99 FAIL Second fast test: CO max 0.30% had 1.91% FAIL HC max 200ppm had 78ppm PASS Lambda 0.97-1.03 had 0.94 FAIL Natural idle test: CO max 0.50% had 0.48% PASS I know there is an ongoing problem with loosing oil at least since 50k as there was an invoice for investigating it and nothing was found. Cant see any leaks or drips in the mornings where it was parked so I assume it's burning it however there is no smoke coming out. There was a bit today during the test but it didn't look abnormal and was more white then blue. I noticed that the spark plugs had black soot on them not sure when they where replaced last time. Hope someone could shed some light on it.