Replacing Air/Fuel & O2 sensor on Cali V6?

[Ride_Red]

So, thanks to "TheDurk" i just found out I have a Cali 2000 4WD LTD V6 Auto?

My mpg is not that great @ 140k and I've already put new plugs/wires/timing belt(s)/air filter/Sea Foam/PVC and fluids. The only thing left is to do is, lube and replace O2. Since it's a Cali model, do I need to replace the air fuel to help increase with my mpg?

Denso and the URD list:
Oxygen / AFR Sensors - Underdog Racing Development

http://www.densoaftermarket.com/catalog/catalog.php?part=o2sn

234-9002 Air Fuel
234-4153 O2 Sensor

For those with this model to these part numbers seem right?

 

[BTO]

If it's not throwing a code then why change the O2? What kind of MPG are you getting?

 

[BillIam]

seems right to me, i just ordered the wrong front sensor myself, spent a couple hours digging and i got the same answers as you, only mine is throwing code p0420, and this cali emissions thing is starting to make my wallet flinch

 

[Ride_Red]

If it's not throwing a code then why change the O2? What kind of MPG are you getting?

Sorry, but I have had a P0420 code showing as well since I go the truck in March. Just didn't realize how bad my mpg was since I started tracking it in November.
I'm getting less than 200 miles on a tank, 3" lift and 33's where already installed before tracking.

*** Sea Foam, then started tracking mpg...
11.2.12
140,056
5.727 gallons/100 miles/17.46 mpg (all HWY)

11.9.12
140156
9.107 gallons/151 miles/16.58mpg (all HWY)

11.11.12
140,307
11.917 gallons/182 miles/15.27 mpg (city/hwy)

11.17.12
140,489
***New plugs/wires/timing belt/water pump/oil change

-----------------------

11.21.12
140,699
12.217 Gallons/172 miles/14.07mpg (city/hwy)

11.25.12
140,871

------------------------------

12.1.12
141,108
12.286gallons
$41.52
7.536 gallons/103 miles/13.67mpg (city/hwy)

12.3.12
141,211
$25.01


12.7.12
141,387
$37.00
11.565gallons/176miles/15.21mpg (city/hwy)

12.12.12
141,575
12.65 gallons/188 miles/14.861 mpg (city/hwy)
*** Deck Plate Mod completed

12.13.12
141,678
$20.61
6.652 gallons/103miles/15.484 mpg (city/hwy)


12.23.12
141,864. (186 on full tank)
$42.95
13.138 gallons/186 miles/14.166mpg (city/hwy)


1.3.13
141,988
$37.34
11.457gallons/123.5 miles/10.78 mpg (wheeling)

1.9.13
142,116
$34.29
10.522gallons/127.7 miles/12.136mpg (wheeling)

1.21.13
142,275
$38.09
11.761Gallons/159miles/13.519mpg (city/hwy)