Another o2 Sensor Question

Slykin · Jan 30, 2010

Ok, so i've been making around 16-17mpg no matter how hard I try to get good gas mileage. I'm aware that i'm not going to get a whole lot higher in town but I thought I could get better than 16.5 driving as easily I could. Anyways, I went under the car and removed one of my o2 sensors that I had noticed looked dented earlier on. I also noticed that both of my o2 sensors look different so i'm betting one has been replaced before. I need to know if you guys would think this one's toast by the looks of it. I think it is but i'm not experienced with this stuff.

Here's the "bad" sensor.

Javi · Jan 30, 2010

How many miles are on the car, still have the factory O2 sensors?

Slykin · Jan 30, 2010

It has 255,000 on it right now.. and no, I bought it a year ago and this was on it. Except the driver's side looks completely different.

Javi · Jan 30, 2010

with all those miles i would go ahead and replaced both......

Slykin · Jan 30, 2010

That's what I'll probably do. I just want to make sure it's broke before I replace it since my parents pay for maintenance on the car.

Slykin · Jan 30, 2010

Oops.. Sorry, it's 155k not 255k haha.

toyman · Jan 30, 2010

O2 sensors do wear out. They can stand only so many heating and cooling cycles. There is no visual way to tell. I can't imagine them being dented while in the exhaust stream so something else has caused those dents which may well have damaged the ceramic element inside.

Paul · Jan 31, 2010

The How-To section has a write-up with the correct Ford part numbers for new sensors.

DFG_magic · Jan 31, 2010

I just replaced both of my 140k stockers with Bosch units. They look completely different than the stocks and I def felt a boost in performance and fuel economy. Well worth the 110$ to replace them. If you have over 100k, replace them; you won't be sorry!

Javi · Jan 31, 2010

these may fit your car?
http://sn95forums.com/index.php/topic,47218.0.html

Slykin · Jan 31, 2010

I already went through that How-To and ordered from where you recommended. Thanks Paul. And yeah, I hope I can pick up some mileage and power, that would be great.