What kind of problems can a bad o2 sensor cause?

[-DSM2NR-]

I was just wondring if anybody could tell me all the problems a bad o2 sensor might cause. And also if it's tricky and expensive to replace a bad o2 sensor.


Thank you in advance

 

[Cool Mr Steve]

Blowing black smoke out your exhaust and poor gas mileage are typical side effects of a bad o2 sensor. I believe I paid 119 for my o2 sensor, and it absolutely paid for itself in gas money. It doesn't look as though it would be tricky to replace, but it can be tough if it is stuck in there like mine was. Soak it in PB Blaster and let it sit for awhile. Then soak it in PB Blaster and let it sit for a bit. Then soak it in PB Blaster and try it out and hopefully it comes out easier than mine did. Good luck!

 

[andymoraitis]

The bove advice is right on, but you can buy a Denso OEM unit from http://www.sparkplugs.com for a fraction of the price. I have one and it's made to be more resistant to leaded gas and has the OEM wire hookups. You can do this with the heatshields on, but if you need more room, the lower can be removed. Total cost with shipping was around $62.00.

The big issue is that you'll be in limp mode and the car will hardly want to move. Also, if you have a logger, a failing O2 usually shows up as being lean, which will make it dump even more fuel on top of a rich condition.

Hope that helps,

Andy

 

[4g63tsiawd]

And showing a lean condition even though your not, will cause the computer to dump more fuel than needed, which usually results in fuel cut.

 

[-DSM2NR-]

I need to replace the lower o2 sensor. Would I have to replace all the threads as well or just the head?

And if I put a new one one my car will run normal not rich again, correct?

 

[93gsx80]

yea thats what i did i used my pocket logger as my bad o2 sensor was throwing a check engine light on. very easy to replace considering they even have like an open socket made specifically for changing on o2 sensor at any of your auto stores usually. and definitely you will notice a change in your gas mileage!!

 

[exiletalon]

And showing a lean condition even though your not, will cause the computer to dump more fuel than needed, which usually results in fuel cut.

I just replaced my engine, and I was hitting fuel cut before and after the swap at 4-4500RPM. Could a faulty O2 sensor be the culprit?- It drives fine, but even after the swap, I still hit fuel cut at the same 4-4500 barrier!