2002 5.4 Supercrew 4x4, stock except K&N and 265/70/17 BFG All Terrains.

I am getting about 13 MPG. I used to at least get 14.5-15. 97K miles, plugs were changed probably 30K ago.

I think its time for new Oxygen Sensors. Which brand do most of you guys go with or recomend?

I have searched and found info on o2's but I have not found anything on any particular brand.

Thanks

 

I use Bosch. A little more expencive but it is worth it!

 

I replaced mine with bosch units. these are the o2 sensors recommended by Troyer performance. I have read that these need to be changed every 30k.

when was the last time you changed your xfer case oil? differential fluids? According to 'Horsepower TV' just changing the fluids to "Royal Purple" earned 10hp at the wheels. I use Amsoil, and personally I think that it DOES have an impact on vehicle performance.

You may want to re-visit the plugs. Troyer suggests DENSO. I used NGK iridium and the truck runs beautifully. I turned in 17.5 mpg on my last tank (mostly highway, crusing @ 70)

I also just installed the 87 performance tune from my new XCAL 2. It is worth every penny! I can hardly wait to try the 93 performance tune.

 

Just use Bosch, since thats who makes the OEM ones to begin with.

 

I changed my front 2 and it didn't help anything. I wasted my money.
Mine had over 160,000 miles on them. Hard miles.

 

check these oxygen sensor, at carpartswholesale, you might find one for your car. look also ebay, there are lots of good choices that you can find.