Originally Posted by mdadrass

Hello all,

Let me begin by thanking all of those that contribute to this fine forum as the information posted here is worth it's weight in gold.

My Problem...SES P0171, P0174 codes coming up on my 2001 4.4i (4/2001 prod) X5 with 59K miles. Here are my issues other than the codes:

1. Low gas mileage (3-4mpg worse)

2. The car stalled twice a while back at very low idle but not since.

3. lower power at full throttle

I checked the 2 vent hoses on the top connected to the oil separator for cracks but could not find any although they really felt pretty mushy and beat up.

After searching the threads extensively I've come up with these solutions:


1. Check/Replace Vent hoses that connect to the oil separator

2. Replace Fuel Filter

3. Clean/Replace Mass Air Sensor

I'm looking to sell the car soon so I really just want the SES light off and done with.

Am I missing anything here or any other suggestions?

Thanks in advance!