I just ordered a Fuel Pressure Testing kit from Amazon for $30, same kit at the auto parts house was $44.29, $56.99 retail.

I don't think there is any rush because the car seems to be running fine though I understand running too rich for too long can damage the cats.

I have the Bentley book so when I get the testing kit I will go through the fuel pressure test. I think this is the next logical diagnostic step.

There have been a lot of P0172 & P0175 reports on this forum, but very few have posted what the final resolution of the problem was.

If you have had this problem, what fixed your X5?