Help DTC P1130 & 1131 ODBII Codes

I have one of those Actron OBDII tools and saw these codes:
P1130 - Insufficent Switching 02 Bank 1 Sensor 1 Fuel trim at limit
P1131 - Insufficent Switching 02 Bank 1 Sensor 1 Sensor / Lean

I have done the following with no luck:
* Replaced both O2 sensors on the drivers side on the car.
* Replaced the MAF
* Replaced the spark plugs (a little worn .007 with just a little white)

I also know the following:
- Oil is changed regularly
- I run 91 octane regularly
- Gas cap is on tight
- Replaced fuel filter 10,000 miles ago
- PCV is good
- K&N air filter is good
- I cleaned out the idle control valve 10,000 miles ago and car idles fine
- Spark plug wires looked good and car gets 21 to 23 miles per gallon on the highway

Car is a 1998 Mustang GT and has 72,000 miles on it.
I would appreciate any suggestions or analysis.
Please let me know if you need any further information.

Thanks,
Alan

Ford dealership says, "...."

I took it to the Ford dealership since I'm lossing my mind over this.
I need to get a more extensive diagnostic tool since I've learned there are more than 20 emission sensors on the car.

Anyway, dealer charged me $74.18 to tell me I have a P0133 code.
They suggested replacing the front right oxygen sensor.
I haven't had any previous codes for the right side. ????
Part $113 (Autozone $80)
Labor $52 (10 minutes on my lift)

I asked them if clearing the code with a scanner like mine or fixing the problem part would do the same to clear the PCM.
They said putting the new part will stop the check engine light from coming one. Yet they also tried to offer "reprogramming" my PCM for $70.
When I asked what reprogramming was or what it did, they told me that this was like rebooting the PCM and would not give any additional driving benefits.

Does anybody else find this odd?
Thanks,
Alan