wrencher

Wild guesses are easy, no way in the world a crank sensor can cause your issue. I'll state as fact that your problem IS related to your bank 1 O2 sensor. You really need a scan tool to monitor the voltage of it to be certain as to whether the circuit has an issue or the sensor itself is the problem. If you have access to a scanner that gives real data and not just a silly code reader, you can look at KOEO voltage of the sensor and it should be near 450mv, if not unplug the sensor and if the voltage rises it is a certainty that you have a failed sensor. If you do not have access to a scan tool with datastream, just go ahead and replace the bank 1 O2( before the catalyst on the drivers side). The reason it runs ok on initial start is due to open loop fuel mode, once it warms up and fuel trim begins updating based on the input of O2 sensors, it is richening the bank to it's limit most likely since the O2 is indicating a lean condition via low voltage. An O2 that is stuck at low voltage will cause a lean fuel trim code because it cannot reach a median voltage where it thinks the fuel mix is correct and the O2 sensors are king in the PCM's programming, it responds to whatever they request. I make a living actually diagnosing problems, not throwing parts at an issue. I do it freelance for many shops and individuals locally after working at dealers for 20 years. I've studied technology diligently for the past 25 years and take great pride in being pinpoint accurate when I recommend a solution. I'm fortunate to have a wife with an excellent job and it allows me to not have to tolerate working with incompetent people that exist in the industry. There are some good techs out there, but far more idiots sadly. About the only thing more misdirected is someone throwing wild guesses on a forum called "Ask The Technician".