So I had the o2 sensors replaced, because i was getting horrble gas mileage, probably around 8 mpg in town. The only code i was getting was 1179, figured it might be something to do with the oil separator being clogged,so i put a new one in. The 1179 code went away, and now i have two more, being p1158. I did a search for p1158 and couldn't find anything other than something to do with an o2 sensor.

• P1158 - Oxygen sensor problem with switching
lean, sensor(s) for bank B

Before I had them replaced i wasn't getting any o2 codes, now i am. Any ideas?

oh, I'm pretty sure my gas mileage increased, hard to say because i had them switched out mid tank, and drove about 45 miles an hour all throughout i95 and i20 to get home last night,on account of the snow,lol
98 disco 140000 miles

 

Let it run a while, the engine is getting used to the new sensors. Or you can take it to the dealer and have them clear your performance.

 

alright then i'll give it some time, see if that'll help.

 

Consider getting a scanner that can read sensors, like your 02's and read their output to see if they are with in specs. With your mileages you may need to change them all out.
You don't need to let anything break in to continue tracking down your problem.

 

He just replaced all of his sensors, Mike.