How many Lambda sensors . . .

[Helmac]

does my 172 RS 2002 have ?

Any ideas ?

Can find the one at the front but keeping reading about rear ones.

If I have two, which one is most likely to cause my emissions light to be permanently on ? And also cant that cause me to be in LHM with the EMW light on too ?

MPG is sitting around 33 to 34.

Thanks,

 

[MicKPM]

Should have 2xH02 sensors on a '02 model. Most problems are caused by the "pre-CAT" sensor but I wouldn't change anything on a whim... diagnostics + live data session will tell you for sure what, if anything, is at fault.