Help...new to the mini. i have an 02 cooper that i just purchased a month ago from a private seller.
The seller had just replaced the upstream o2 sensor due to the p0130 code(bosh sensor). The ck engine light came on for me and the code was p0130. i checked with my scanner and the sensor was no longer active not swicthing at all and staying in open loop condition. i replaced with same sensor cleared code and saw it was active but not going closed and the light was triggered again.
things done:1) replaced sensor. light came on before 10 miles.
2) cleaned throttle body was filthy and sticky. this cleared code the longest about 30 miles.
and went into closed loop condition.
3) checked fuel rail pressure 40psi.
4) checked injectors w/stethescope appear to be working.
5) put in non ethenol gas and injector and valve cleaner.
sensor still appears to be working voltage switching and going closed loop then open drive etc.
i can clear code but comes back on in a matter of 10-20miles.
can't figure it out.

 

Make sure the O2 sensor heater circuit is getting voltage.
What are your fuel trim values?

 

A few folks have found non-oem replacement's are troublesome....
Wonder if the sensor is junk....

 

i hate to say it, but you should get the NTK brand replacement. it can be found on amazon for ~$90.

i just had the same issue, however, i have the NTK replacement. it ended up being that my connections were just a bit finnicky.

after unplugging and replugging the electrical end of the sensor a couple times to make sure it was proper, i cleared the code and the light remained off.

i forget the part number for the NTK but if you find the other thread, it should be there.

a lot of people have trouble with the upstream sensor if its not NTK. i suggest if your downstream has never been replaced, move your new bosch to the downstream, and put the NTK in the upstream.

if no part number, search amazon "mini cooper o2 sensor ntk".

 

now i forgot already the name of the first reply..but:
@ 188degrees closed loop and 2235 rpm stft is -11.7% ltft is 3.1%
@ idle same temp stft is 0.0% ltft is 7.3% this was ol-drive condition.

i am reading more about using non universal o2 sensors... i just dont want to believe it. can they really be that finicky.

thanks again if these # make you think something else let me know.

 

Yes the cars computer can be that picky....tiny varibles like the length of wire attached to sensor or the quality of the clip...don't even think of the old style solder and shrink-wrap type where you reuse the old clip (hopefully folks that try one reuse the old sensors clip, preserving the wiring on the car side for the next sensor...they will be buying one in weeks..)..
Just getting a speck of anti-seize from the treads on the end of the sensor can destroy one...
Do yourself a favor.... Buy a new one...preferably two (when one goes...the other is usually weeks away)....as mentioned...you could try swapping the pre-cat and post-cat sensor...might work...might not...
Good luck!

 

thank Zippy
i am going to order up a new one and put the bosch downstream as mentioned. hopefully be done with it. i can find no other explanation.
jerryt

 

you called it ntk o2 sensor. installed it saturday 150 miles noticible improvement and no ck engine light.
thanks jerryt

 

Had that code and turned out to be the wires of the o2 sensor leaning against the exhaust heat shield. I bent the shield out of the way and code was history. I realize it may not be such an easy fix for everyone but I was really glad it was such a stupid easy fix.

 

Were the wires damaged? Otherwise that's a strange problem.

 

fyi... I had the same issue with the bosch. My mechanic did lots of tests and he thinks that the Bosch would not warm up fast enough to satisfy the mini computer. He had a used mini sensor that fixed it up.

 

No and it has protective sheath on it but it leaves the wires an inch or so away from the sensor and that is where heat shield was touching