I thought I had this X5 fixed. (2001 X5 3.0)

After getting the SES light and codes P0172 & P0175 I bit the bullet and replaced the MAF sensor.

Before I replaced the MAF sensor I was getting the SES light and codes after about 5 starts and 30 miles. After I replaced the MAF sensor I drove for nearly a month, several 100 miles and dozens of starts before the SES light came on. I was sure I had this fixed.

What are the next logical failures? Many say the fuel pressure regulator or vacuum line to it. How do you go about testing the fuel pressure regulator?

Some list the MAP sensor, can this be checked without a dealer type scanner? Same for the Coolant Temp sensor or Air temp sensor?

The car appears to be running perfect, no abnormalities when driving.

Can you help?