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X5 E53 (1999 - 2006)
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  #1  
Old 08-17-2016, 03:35 PM
glw765 glw765 is offline
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Location: Cleveland, Ohio
 
Join Date: Dec 2015
Posts: 6
Mein Auto: 2001 BMW X5
Car runs horrible - codes P0491 & P0492

BMW X5 3.0
175,000 miles

Check Engine Light is on with code 0491
Car started running sluggish every morning and after driving about a mile the cars starts to stutter/hiccup/jerk with low power(I canít think of any other way to describe it) when accelerating.
Changed #51 & #62 fuses and secondary air pump relay (to get rid of the code Ė didnít work)
A gear/circle shaped light with an exclamation point came on (it said Transmission Failsafe Mode Indicator when I looked it up) & car was stuck in gear after exiting the highway.* I reset it and it drove home.
Next day went to the store and the battery died.
*
Replaced the alternator & bought a brand new battery.

Check Engine Light is still on with code 0491
Car still hiccups when accelerating with low power and the Transmission Failsafe Mode Indicator has come back on.
Car also pauses when putting it in Drive after backing out of the driveway.
Car stalled after filling the tank with gas

AutoZone says the code says itís the Smog (AIR) pump* Please help.*
*
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  #2  
Old 08-24-2016, 05:34 AM
TTCummins's Avatar
TTCummins TTCummins is offline
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Location: Superior Township, MI
 
Join Date: Mar 2010
Posts: 372
Mein Auto: X5 4.6is Alpina
on the front of the head, passenger side, there will be a very fine vacuum line, probably only 1/8" or 3/16" going to the secondary air injection valve. that vacuum line rots through and will cause the issue you're seeing. If it isn't that one right up front there, there are two more on the rear of the intake manifold that need to be checked out.
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  #3  
Old 08-26-2016, 06:21 PM
glw765 glw765 is offline
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Location: Cleveland, Ohio
 
Join Date: Dec 2015
Posts: 6
Mein Auto: 2001 BMW X5
Thanks for the reply. I will have that checked and let you know.
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