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E46 Xi Forum
The E46 XI was produced from 01-05 in sedan and touring body styles. Powered by either a 2.5L inline 6 in the 325xi or a 3.0L inline 6 330xi. Discuss all thing about BMW AWD E46 'Xi' here.

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Old 08-22-2013, 06:43 AM   #1
Arnezie
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SOLVED What could it be? Codes P0171 P0174

Ok driving to work today on the highway the service engine light comes on and all of a sudden it is super jerky , push down accelerator and it acts like I'm pumping the pedal. I could get it to around 60 mph and that's it. Also when it was doing this the mpg needle would shoot down to 0 , no smells no other issues. I know I need my codes read but have a couple hours before the auto parts store opens.


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Old 08-22-2013, 07:21 AM   #2
Kubica
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Hopefully a crank sensor or something simple.
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Old 08-22-2013, 08:19 AM   #3
Arnezie
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What could it be?

Hopefully heading to get codes read now .


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Old 08-22-2013, 09:32 AM   #4
Arnezie
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What could it be?

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Got it to autozone and read the codes and then wouldn't run at all Click image for larger version

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Old 08-22-2013, 10:40 AM   #5
SamDoe1
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Lean codes, looks like you need to get your intake boot checked for cracks and tears. Other thing could be fuel pump and filter. Based on the sudden onset and severity of issues, I'd point to the fuel pump and filter.

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Old 08-22-2013, 11:07 AM   #6
bmwbob89
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Sounds like a failed fuel pump. Do a search as I've posted an easy way to diagnose a bad pump.
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Old 08-22-2013, 11:17 AM   #7
Arnezie
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What could it be?

Quote:
Originally Posted by bmwbob89 View Post
Sounds like a failed fuel pump. Do a search as I've posted an easy way to diagnose a bad pump.
Thanks I'll look for it. I guess I thought the fuel pump would have it's own code :/


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Old 08-22-2013, 05:37 PM   #8
Arnezie
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What could it be? Codes P0171 P0174

Thank you to all of those that helped me I learned a lot it turned out to be the fuel pump changed it in about 20 minutes in The driveway. The only bad thing is the only pump I could get a hold of was a non-OEM oh well. 150 bucks and she's rolling again.


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Old 08-31-2013, 10:10 PM   #9
jmo69
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I just went through this with my e46 and got no codes either, luckily a friend borrowed me his e38 till the VDO pump showed up. At least it's easy to replace when it does fail again.
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Bad outer xi ball joint? https://forum.e46fanatics.com/showthread.php?t=1127077


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Old 09-01-2013, 12:09 PM   #10
White_Knuckles
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It's recommended you change out the drivers side, cartridge shaped fuel filter under the car. The filter has a pressure regulator built in. The reason to change it is, should the filter be restricted or the regulator is failing, it may cause premature pump failure. And if it's unknown when/if it was ever changed, it's due anyway. Dealers and Indi's usually change 'em together when the pump takes a dirt nap.

I changed mine together and the car actually felt peppier. Nice.

Edit: >> not saying that your car will enjoy a boost from a new filter. My pump could have been weak but never threw codes, she just died. I suspect the new filter made it happy but pure speculation.
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Old 09-01-2013, 08:13 PM   #11
Arnezie
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Quote:
Originally Posted by White_Knuckles View Post
It's recommended you change out the drivers side, cartridge shaped fuel filter under the car. The filter has a pressure regulator built in. The reason to change it is, should the filter be restricted or the regulator is failing, it may cause premature pump failure. And if it's unknown when/if it was ever changed, it's due anyway. Dealers and Indi's usually change 'em together when the pump takes a dirt nap.

I changed mine together and the car actually felt peppier. Nice.

Edit: >> not saying that your car will enjoy a boost from a new filter. My pump could have been weak but never threw codes, she just died. I suspect the new filter made it happy but pure speculation.
Yea I just changed the filter also the other day, crazy that the filter was harder to change than the pump.
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