I used my code reader and found out one of my o2 sensor's is bad. It says "Bank 2" holds the bad o2 sensor. Which side is Bank 2, passenger or drivers side? I don't want to waste my time have to install an o2 sensor twice.

 

bank two driver...whats the code?...how many miles?and what year and size engine?

 

1997 F150 4.6L, 149200 miles, the codes are 0153, 1151, 1152, if I remember correctly. 0153 means faulty o2 sensor bank 2, 1151 means bank 2 runs lean, and 1152 means bank 2 runs rich. (the codes and info, I'm going off memory). Physically, both the o2 sensors look fine, so I can't tell which bank is which. Can't find it in any manuals or anything. I want to change it soon because my gas mileage is going to hell.

 

With 149k I'd change both of 'em

 

but I would also check the 90 behind the throttle body from the PVC valve for any cracks...I checked mine this weekend..pulled the PVC and put my finger over the end and it had a real good vacume on it and no loud hissing noise from behind throttle body when I did that..although I am going to go ahead and change out the valve...it started fluttering when I took my finger off it...seems to be gumming up inside

 

When my parents owned the truck, they had one replaced at 105k miles, but they don't know which one was. You guys still think I should replace both?

 

I'd replace them both. It's sort of like buying one new shoe.

They're only 49.99/ea at autozone. or 52.99/ea at checker