2G AFR goofy/ O2 sensor bad?

[stud3737]

Ok fellas, I got done putting a punishment racing O2 housing with recirculated wastegate on my car and ported out my turbo. I get everything put on and throw some 50/50 coolant in my car and go and fire her up. I notice my AFR is really lean (also rich at other times) at idle and while driving it is all goofy too (while cold and when it is warmed up) Not cool. Go to drive it home to go and hook up my laptop to check some things out. It threw the code P0125 (insufficient coolant temp for closed loop fuel control). I cleared the code to see if it would come back on and it did once more. I get home and check things out on link. My coolant temp is fine, t stat is opening as it should. But I notice my front O2 sensor ISN'T cycling at all. It is moody and the highest it really ever went up in voltage is .2 or .3 volts. At idle and while driving on the highway. It worked perfectly fine before I installed everything on my car. I think it is bad... kind of weird how it would all of a sudden quit working tho... You guys think it is my O2 as well or am I just crazy? Nothing else I can think of... Rather see what you guys think it may be before I dish out the cash for a new oem one just in case that isn't the problem. I did do a lot of searching but I still think that my O2 is just bad...

 

[Type1DSMr]

Are you using ecmlink to monitor the front o2? If it isn't cycling I would replace it. Amazon usually has them for around 30plus.

 

[stud3737]

Yup I am using link. Want me to post a log? Wouldn't an oem one be better or are they pretty much the same

 

[Type1DSMr]

Yes post a log. I'm using one from amazon a Bosch one and don't have any problems cycles just fine according to link.

 

[stud3737]

Here's the log! Stuck in open loop. Even when it was in closed it still didn't cycle

 

[stud3737]

Problem solved. The O2 sensor was bad

 

[baws]

Thanks for updating your post.

 

[my dreamt dsm]

Interesting, I am having the same problem. Same code also. Did tons of research on code 0125 and mechanics say most of the time it's the o2 sensor that throws that code. Will I replace my o2 with a Bosch one and its like it died right off the bat. Same problem even with a new engine coolant temp sensor.
EVOSCAN shows the o2 cycle lime once or twice and then it dies. No more fluctuating or reading from evoscan. Why or what would cause front o2 not to get hot or cycle. Car is stuck in open loop.

 

[rough]

Installed a MTX-L with the 4.9 sensor, everything seemed ok for a few weeks, now i'm getting this P0125 as well. Subscribing.

 

[FilmerDude]

Mine only reads .2 to .3 no matter what engine load. Car won't hold idle and smells really rich once in closed loop. Just bought an O2 hopefully I'll get the same result of it being fixed!

 

[rough]

My 02 sensor is new, I see my front o2 locked at like 1.8 and my rear 0.07 I have no fuel trims visible in evoscan though
Makes me wonder if there is something wrong with my new o2 sensor :/

Glad op figured out his issue!