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E46 (1999 - 2006)
The fourth generation 3 Series (E46 chassis) was introduced in 1999 and set the standard for engineering and performance during it's years of production including being named to Car & Driver's 10 best list every one of those years! ! -- View the E46 Wiki

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  #1  
Old 10-15-2012, 10:11 AM
colwell2008 colwell2008 is offline
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P0171 & P0174 after I added coolant, help!

I added BMW branded coolant (50/50 mix with distilled water bought from walmart), not a flush, because the coolant light was on and off two days before, and the level of coolant was low.
After approx. 40 miles drive, "service engine soon" light was on. Code was read as P0171 & P0174.
Mine is 2003 325i. I only had minor issues before, like light bulbs, no engine related issues.
Does the coolant that I added have anything to do with the code? Or it was just a coincidence that the SES light was on on the same day?
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  #2  
Old 10-15-2012, 10:29 AM
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jonathan2263 jonathan2263 is offline
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Quote:
Originally Posted by colwell2008 View Post
I added BMW branded coolant (50/50 mix with distilled water bought from walmart), not a flush, because the coolant light was on and off two days before, and the level of coolant was low.
After approx. 40 miles drive, "service engine soon" light was on. Code was read as P0171 & P0174.
Mine is 2003 325i. I only had minor issues before, like light bulbs, no engine related issues.
Does the coolant that I added have anything to do with the code? Or it was just a coincidence that the SES light was on on the same day?

Those codes have nothing to do with your cooling system, it's just coincidental that they happened on the same day.

Those two codes could point to a vacuum leak. Start by checking your intake boots for leaks. Then move on from there... possibly MAF sensor or O2 sensors.
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  #3  
Old 10-16-2012, 07:11 AM
colwell2008 colwell2008 is offline
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Quote:
Originally Posted by jonathan2263 View Post
Those codes have nothing to do with your cooling system, it's just coincidental that they happened on the same day.

Those two codes could point to a vacuum leak. Start by checking your intake boots for leaks. Then move on from there... possibly MAF sensor or O2 sensors.
thank you!
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Old 10-16-2012, 07:53 AM
jdauria jdauria is offline
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Quote:
Originally Posted by jonathan2263 View Post
Those codes have nothing to do with your cooling system, it's just coincidental that they happened on the same day.

Those two codes could point to a vacuum leak. Start by checking your intake boots for leaks. Then move on from there... possibly MAF sensor or O2 sensors.
Second this, smoke test first for vacuum leak, check MAF - faulty or just needs a cleaning, lower intake boot may have a crack/tear, fuel filter may need replacement etc
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