I need to change both o2 sensors on my truck but can't get them to crack loose. Any idea's as to how I get these things out?

 

PB blaster let soak, beat the crap out of'em or just cut the peace of pipe off.

 

Got heat? Warm 'em with a torch. Or, drown them with chemicals. A tight wrench, and breaker bar works fairly well too.

Why are you replacing the rear O2?

 

cut the wires off put a box wrench on it and then slide the box end of another wrench over the open end of the wrench on the o2 sensor and yank! should loosen with ease! i had no problems at all taking mine out and i live in new england where they over salt the roads in the winter!

 

I'm replacing them cuz the truck has 162,000 miles and I'm pretty sure they are originals. Plus the truck just seems very drowgy at times and the shop i go to told me they were bad (engine light).

What's PB blaster?

 

pb blaster is by far the best rust penatrant on the market!

 

The rear 02 sensor just checks to see if the catalytic converter is working. It doesnt affect performance. Just change the front one with a NTK or Denso sensor.

PB Blaster or Aero Kroil, heat, and a large cheater bar.

 

Drive the truck get exhaust nice and hot then spray some lubricant and hop under there with a nice size adjustable(i used an 18") and it should come right out

 

Thats the stuff I used to take out the rust on my truck when I was puttin lift on, good stuff man. If you take out front sensor you have better flow? I cut my pipe off behind cat then got flex pipe and bend it down as weekend warrior but put'er back on when it gets annoying haha. Irrelevent but I thought id say lol.

 

Haven't tried CRC Freeze-Off yet, huh?