code reads a (o2 sensor circuit bank 2 sensor 1) is that code implying a fault in the circuit or a high or low value. fuel trims bank1 long ft 6.23 short ft 2.34
bank2 long ft 6.23 short ft -2.34

these were the freeze frame values

trying to determine if it is a circuit problem or fuel problem. long term ft are the same but somewhat high, maybe an air leak past the maf sensor. any ideas anyone

thanks

 

Need the year and mileage of the trk.

 

sorry 1999 discovery 1 133,000 miles, passed emissions i CO and light came on the next day

 

I would have to say bad O2 sensors. What sucks though is that you have 4 of them and you cant just replace one, you must replace all four.
At least you passed inspection though.

 

yeah i think ill replace those O2 sensors, I always assumed that they dont normally just go bad. I'm just curious if the bad sensor is just a symptom of a larger problem. Of course 130k on the original sensors seems likely they are just old.

 

They wear out around 60-70k and then fail around 80-90k.