As I was driving home from work, the check engine light came on.

Had it scanned and it's the front O2 sensor.

I expect I can do this myself... anyone got any good tutorials?

I'm not even sure where it is, what i'll need, or how long it will take me.

Please help. Thanks.

 

Found it. Easy stuff.

Now if I could only get the electronic connection to let go.

What's the trick to this thing? I can't figure out why it's not releasing. There's some sort of red thing around the connection... do I need to unsnap that or something?

HELP!

 

The red clip slides out. You need to slide the solid side out of the gray portion of the plug.
I always stick a skinny screwdriver between the red clip and the plug and turn the screwdriver to get the clip to start sliding.

 

Figured it out. Before you mentioned it, that's exactly what I did... put a screw-driver in there and turned it.

Can't believe I couldn't find that info anywhere on the net... and of course, the Haynes manual didn't mention it all.

 

Sorry I got on late or I would have walked you through it.

 

No problem... I was freaking out because it was a race against the sunset. Not to mention I live downtown... so no driveways or garages available to me. I ended up doing it in the grocery store parking lot around the corner.

Got it down. 2 hours after the CEL came on, I had the new part located and installed. I'm proud of myself. :-)

 

Congrats!

 

Problem still not solved apparently...

Driving to work this morning the CEL pops up again.

And again, it's the same codes...

P0141 - O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 2)
P0137 - Oxygen O2 Sensor Circuit Low Voltage (Bank 1, Sensor 2)

So the P0141 implies either a bad upstream O2 sensor or a bad wiring harness (is that just the wiring harness going INTO the sensor?)

From what I read, P0137 is from the rear sensor?

Should I have replaced these as a pair?

What in F is going on here?

I've noticed that my fuel economy has dramatically decreased over the last year... I check the CEL bulb and it was burned out. So I replaced it... the next day it comes on. I replace the upstream O2 sensor and then 2 days later (today) it comes on again and throw the same code?

 

Replace the rear one. Always replace things in pairs, ie you don't replace one strut, you replace them both. Same as 02 sensors. If you're going to replace one, replace the other. If the code is for the rear sensor, replace the rear sensor.

 

Tech? You want to walk me through the rear sensor?

 

How long do O2 sensors typically last? I had the dealership replace the rear one when I got the car in 2005... probably 5 years is beyond the "warranty"... but your thoughts?

 

I don't know, depends how many miles you've driven in those five years and how everything else in the car is. There is no definite age.

 

You are useless to me. ;-)

 

I'm sorry, I didn't mean that, I lost my temper and took it out on you. I regret my behavior. ;-)

 

Could still use the help.

Where is the rear O2 sensor? Can I do this myself?

Picked up the part tonight ($128.99)... going OE direct fit... and thinking i'll tackle it this weekend.

Any help?

 

Look under the car. After the cat. It's not different than the front O2.

 

The sensor is at the back of the cat. It is just as easy as the front one to replace.
If the front one was bad for a while it took the rear one out.

 

you will have to remove the cross plate underneath the car as well to get to it at least it was that way on my 95 turbo. O2s will last a while if the engine is healthy, my 91 shelby daytona had its original o2 at 175k miles, it was then starting to fail and make the fuel mileage go down. i know they say like every 60k, but i dont think thats necessarily the case. O2s on these are simple to replace, my 91 daytona is a pain the intake and exhaust are on the back side and with the turbo in the way its a pain.

if you compare an 850 to say a new ford or japanese car you'll see how simple working on these are. even to this day i would say the 850s are still some of better engineered cars I have ever owned. sorry to ramble lol

 

Wow, that was easy. Even easier since I just did the front O2 sensor and knew what to expect with the connector.

Yea, thanks for mentioning the plate over it... I wouldn't have seen the sensor under there. But it was an easy removal. I'm upset at myself for allowing a mechanic to charge me $300 to do that for me when I got the car in 2005. I could have done both of them for less than that (cost of the parts, $140 front, $130 rear) and in under an hour.

First 100 degree day we've seen here in Colorado in 2 years... and I'm out there changing an O2 sensor... brutal. But after it, I was so fired up that it went so well that I did the horn relocation as well... put them under the battery tray just over the air-guide. Love it... no more horns in the grille. :-)

Thanks for the help guys. This work is going smoothly.

Up next... repair the instrument cluster connection and install sidemarkers...

 

Sorry to come in late on this but from reading I understand that the your Cel came on indicating a faulty front o2 sensor, so you replaced that and then the same code came back along with the rear o2 code. Did It work? I assume the o2 codes have not come back on since you replaced both? My car threw the smae codes as yours, so replaced the front and then the same front code came on along with the rear and I am hesitant to replace the rear since it cost so much to replace the front and the code came back.