on my 51 plate 147 2.0 got a bad sensor reading of p0141 (o2 sensor heater curcuit bank 1 sensor 2) wich i know is lambda sensor
to check i had the right lambda i unplugged the offside precat (bank 1 sensor 1) that threw up a code relating to correct sensor cleaned contacts with contact cleaner
then checked nearside as i thought threw up bank 2 sensor 1 fault once again cleaned
then unplugged third sensor wich threw up bank 1 sensor 2 fault (p0141) so now i know wich sensor / connection is faulty (ok pace palm we are dealing with alfas here)
clean all connections dry them right out from the solvent replug everything should be good
drive up road about 6 miles flick up fuel consumption and at 60mph am doing 16mpg
about 500 yds further on engine managment light comes on so i flick up torque and show fault codes p0141 (ok i know this one so post cat lambda is busted), also new codes are p1177 and p1178
now been reading forums and there seems to be confusion over these codes could they be where i cleaned the precat sensors (so i need to take em apart reclean and check properly) OR is it more likely to be the MAF sensor gone as well?