Hi everyone. I am new to using forums so forgive me if I make a mistake.
I have an ‘05 r52 na. I got the dreaded 2096 code. On the graph it shows to be switching fine. The voltages are within range. I ohm tested the heater and got a reading of 4 ohms. I can’t find what the ohms should be anywhere in the service manual or online. The general info says anywhere between 10-20 ohms which would mean mine is low. However those are not official BMW Mini numbers. Does anyone know what proper ohm reading should be?

I just replaced the crank pulley. Immediately after that, I got the engine code 2096. So I’m not sure if I knock something loose and getting a vacuum or exhaust leak or it’s all just coincidence in the O2 sensor is bad. If this has been discussed already in another thread, please direct me to that thread.
Thanks for your help in advance

 

According to my records, error 2096 is a lean condition on the downstream sensor, not a heater circuit error.
If the upstream sensor is reading normal then possible causes are an exhaust leak, faulty cat or faulty sensor.

 

Correct. It also threw a 0130 code for the pre cat side. Cleared all codes. Then the 2096 came back. So decided to see if the precat sensor was faulty and causing a trim change that would cause the post cat to throw a code.

It’s entirely possible that I’m overthinking the whole thing.

 

Just checked again. Same code 2096. Graph shows pre cat o2 switching from .1 to .7ish. Post cat o2 switches around .74 to .76ish. Not totally sure what that means.

 

So did you change out the pre-cat sensor?
If not, start with that and clear the codes. Yes, it's entirely possible for a faulty pre-cat sensor to cause erroneous readings from the post-cat sensor.
If you've changed the pre-cat sensor and you're still getting 2096 then think about replacing the post-cat sensor too.

Pre-cat readings should fluctuate (usually 0.2V - 0.8V) with a running average of 0.5V. Yours seems to be a little lower than that.
Post-cat should hold steady around 0.5V and since yours is higher it's triggering 2096

 

I haven’t changed either one yet. Want to make sure, if possible, that it is faulty before I go buy parts.
So if I’m reading your post correctly you’re thinking the same thing I thought. That the post cat one is triggering the light but maybe because the pre cat one is faulty and the PCM is compensating for it which would cause the post cat to swing high. Which is why I want to test the pre cat sensor.
I should test them both though.

Hate to drop $100+ on a part I don’t need.

 

Ok. So I’ve had a second look at this situation.

code:2096 o2 sensor (after cat) exhaust-gas composition indicates o2 sensor fault (before cat)

live Data: idle at 800rpm
o2 sensor controller 4.60%
throttle 2.35%
mixture adaptations.23 mg/stroke
adaption mixture multiplicative 0%
Air mass 12.50 kg/h
Average short term mixture, correction -5.10%
Engine load 26.67%
Long Term multiplicative mixture correction 5.31%
o2 sensor before cat 0.06 - 0.87 switch
o2 sensor after cat 0.75 - 0.80 switch
Short term mixture, correction bounces from -4.36 to + 3.48

Everwhere I look it says the code means a lean condition. However, the downstream sensor is reading a bit rich. Makes me think the before sensor is reading lean and adding fuel. But, the trims are all within range. As far as I know.

 

Well, today I unplugged the downstream sensor and oil came out! No oil was on the outside of the wiring harness yet oil was inside the connector.

 

Could be another engine sensor leaking oil into the harness.

 

Ya I believe it is. The real question is is this causing my 02 code issues? I would think so but….

 

Ok. Downstream sensor replaced. I’m pretty sure it was bad because I swapped it out to the upstream spot and readings were all over the place. From 0 to .03v definitely not normal graph anyway.
Now I’m trying to figure out if the 2096 code is a hard code or not. My scanner will not delete it at all. Also wondering if I have to take it to the dealer or if enough drive cycles, it will clear out on its own.