Replace front o2 sensor procedure - Very Easy or Easy? | Thread profile

Hey, glad it worked and you got some help. Just trying to "re-pay" some of the many tips I've gotten here. BTW, I saw HORRIBLE gas mileage on the first fill-up AFTER the new sensor. Only got around 190 miles on that tank! But, on 2nd fill-up, back to normal. Getting around 330 miles to a tank.

The front passinger side is Bank 2 Sensor 1. As an FYI...Bank 1 is on the driver side...and is so named (as I was told) because this is the same side as cylinder #1. Bank 2 (and cylinder #2) is on the opposite side of the engine (passinger side). Since I changed the sensor, (just as Wellcraft19 predicted) I'm seeing HUGE fuel efficencies...which translates into money saved given today's gas prices....

check engine light indicates I need to replace the front , passenger side o2 sensor. I have the part ordered, and was just wondering: 1) how hard is this to replace? I'm not exactly savy at this type of stuff, but I can do some basic stuff 2) any procedures/pics to where I can find the o2 sensor? I'm not even sure I know where to look Thanks!!!

PS O2 sensor from through the wheelwell w/ splash guard removed. -Mark

I'm not a big guy, the truck is on 33's and OME, and I just lay on my back and get them from underneath. Very very easy.

Is the passenger side bank 2? Need to change mine as well. Same code Thanks!

it's pretty easy.. i was just under there with my friend to tap into the sensor wire for an air/fuel guage.. pretty easy access once you remove the skid plate. 12mm blue wire is the sensor wire. .1v - .7v black sames to be power white ?? 4 wires

Quote: Originally Posted by Wellcraft19 I did measure the old sensor and it looks like it is a 22 mm, but caliper is not of that high quality so it might be a 21 mm. I think it's actually 7/8" (at least, that's what the special O2 sensor socket I purchased was), which translates to just a hair more than 22mm. Both sizes should work if you are just using a wrench. The socket was a little hard to use in the cramped space when...

Had the P0155 on wifes truck, went in through the wheel well and ran into more hard lines than mark. Used a 7/8" O2 crows foot that was like a flare nut wrench. Like others said, the hard part was getting plug undone...finally figured out to slide a small screwdriver under the tap and slightly lift, which allowed plug to slide out.