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Check your actual fuel pressure first! When an engine is cold it requires more fuel. If the the fuel pump is weak, either pressure or volume, it will cause the lean backfire.
One thing about code readers at parts stores. All it does is tell you which circuit the computer is seeing the problem in. The problem could be 4 different things.
1. a problem in the computer
2. a problem with the wiring
3. a problem with the sensor/actuator
4. a mechanical condition causing the sensor/actuator to go out of range
To be honest the most mis-diagnosed part on a vehicle is the oxygen sensor. if the fuel volume is low you are going to see it as a cold start issue first (at least up here in Minnesota). This is usually associated with misfire codes and oxygen sensor codes. After you check fuel pressure/volume and if it is in specification I would do a smoke test on the intake. I have seen quite a few intake gaskets fail and cause this also. The unfortunate part is the old way of using propane or brake cleaner to find the leak does not work as well as in the past. Google homemade smoke machine and build one. I did it for $20.
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