Hi All,

Some months ago the Fabia failed the emissions test with a recorded lambda value of 0,73. I since had a friend connect a scan tool to understand better what is causing the problem. From the attached picture one can see that sensor b1-s1 is 'not ok'. Could this be the likely cause? The particular Fabia is the 1,2l 64hp petrol.

Thanks,

Halse

Sons failed due to a very slight leak in exhaust which affected emisions. MOT guy sealed it up with black stuff and it passed. It wasnt noticeable as in loud but he noticed some black soot around the centre join. My fault as I hadn't tightend it up properly after a rushed flexi repair.. He was surprised such a small leak could affect emisions. Same as yours 1.2 HTP. Might be worth checking yours for leaks.

Alasdair

Thanks for the tip. Any further comment on the obd read-out would be appreciated. It reads in the bottom of the screen b1-s1 "not ok" ( believe that is bank 1 sensor 1). If there was an exhaust leak could this cause the sensor to throw the 'not ok' reading?

2 hours ago, Halse said:

If there was an exhaust leak could this cause the sensor to throw the 'not ok' reading?

Not sure,If the Not ok means that the sensor is failing or perhaps a wiring issue then I reckon that woud affect emmisions and ping up not ok. I Im no expert at all but learning. The voltage on sensor 2 is .78V and sensor 1 is .16V but I don't know if this is normal but it might mean that theres bad connection somewhere or the sensor needs replaced.

Alasdair