How many miles are on your 2006 4.4L?
Have you had other trouble codes recently show up?
Are the O2 sensors original?
Understand that with the exception of the Evap Monitor the O2 sensors are typically used for ALL other Monitors. They are "Detectors" to tell the DME how the rest of the engine fuel management and catalytic converters are functioning.
The SAP system should be the very first Readiness Monitor to set and while I am do not know the 4.4L SAP system if it is like the system on the I6 engine, the Pre-cat O2 sensors detect if the SAP is running and lazy Pre-cat O2 sensors WILL cause the SAP Readiness Monitor NOT to set.
See graph attached below of Lazy vs Fresh Pre-cat O2 sensors monitoring the SAP system on an I6 engine. The fresh O2 sensors have the deep "V" behavior. And this data was gathered with the OBDFusion App.
I seriously HATE INPA for Driveability issues. You NEED a decent generic OBDII tool or App. The screen shot from INPA is a bit washed out and hard to read.
OBDFusion IS the App to get.
If you have a smart phone or tablet, get an OBDII App and interface so you can read the codes along with Live/Realtime or Freeze Frame data then you will know exactly what is going on with the engine fuel management system.
The OBDFusion App and proper VeePeak interface from Amazon are less than $40 for both for iProducts, less than $20 for both for Android.
OBDFusion for Android is $4.99 from the Google Play Store.
For Android this lower cost standard Bluetooth interface in the link below works well, but DO NOT try to use this with iProducts.
https://www.amazon.com/Veepeak-Bluet...peak+bluetooth
OBDFusion, for the iProducts it is $9.99 from the Apple App Store.
For iProducts you NEED a LE Bluetooth adapter which are more expensive. VeePeak now offers a LE Bluetooth interface that is compatible with OBDFusion in the link below. While people have used the Wifi adapter, I would HIGHLY recommend NOT using Wifi with iProducts, brings a lot of baggage and stability issues.
https://www.amazon.com/Veepeak-OBDCh...ywords=veepeak
You will be able to generate reports and post or email them directly as well as easily Log data for review.