Bimmer and 1 Series newbie - 2001 135i N55 - P2096 and P2196

[vtraudt]

Intermittent

P2096 Post Catalyst Fuel Trim System Too Lean Bank 1
P2196 BMW - O2 Sensor Signal Stuck Rich Bank 1 Sensor 1

Seem to be contradicting: System too lean and O2 sensor too rich?

Or is it just a matter of the O2 sensor stuck in rich, resulting in the ECU running the engine lean as a consequence?

[BimmerBreaker]

Not contradictory IMO. If the O2 sensor is reading rich it will try to make the engine run more lean. Its throwing the system too lean code because the O2 sensor is telling it to run more lean than the engine will allow.

Likely caused by a bad O2, but I don't know enough about these engines yet to know for sure. I assume you meant 2011 135i?

[jklosterman]

Yes 2011. Also pulled these from a Bavarian tool for the same car.http://img.tapatalk.com/d/14/07/02/y9aje4e6.jpg http://img.tapatalk.com/d/14/07/02/mu9a8ugy.jpg

Any other ideas?

[vtraudt]

Not contradictory IMO. If the O2 sensor is reading rich it will try to make the engine run more lean. Its throwing the system too lean code because the O2 sensor is telling it to run more lean than the engine will allow.

Likely caused by a bad O2, but I don't know enough about these engines yet to know for sure. I assume you meant 2011 135i?

My take as well after digesting/reading the codes again. Just never came across a 'stuck rich' code before.
Now trying to find a generic Bosch wideband (correct?) 5 wire (correct) sensor to cut out the old B1 S1 and replace with new.
Any Bosch part numbers? Sources?

Are all N55 models using same B1 S1 sensor?

[BimmerBreaker]

I wouldn't use a generic anything. Get the proper sensor if you want to really fix the problem

I thought these cars were too new for people to even consider generic stuff... guess if I do get a 135i I'm going to have to take a closer look than I anticipated.

[vtraudt]

I wouldn't use a generic anything. Get the proper sensor if you want to really fix the problem

I thought these cars were too new for people to even consider generic stuff... guess if I do get a 135i I'm going to have to take a closer look than I anticipated.

The only difference between Bosch universal wideband and model specific Bosch is the plastic connector. Not only are the universal Bosch (narrow and wideband) much cheaper, but it is often much easier to cut and solder the 5 (or 4 for narrow band) wires then getting the complete sensor with connector off the harness/engine.

Note: I am NOT talking about generic brand sensors (had in deed bad experience, model specific or generic), but rather original (OEM) Bosch sensors heads (and just reusing the connector/wire portion).