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General E46 Forum
This is the place to get answers, opinions and everything you need related to your E46 (sedan, coupe, convertible and wagon) BMW!

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Old 07-09-2013, 01:29 PM   #1
AjiiE46
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System too lean?

I keep getting a engine light and the fault code is P0174 - System too lean (Bank 2). What am I looking at? Any feedback will be appreciated.
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Old 07-09-2013, 02:00 PM   #2
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Intake/crankcase air leak(s). Common problem on these car at this age.

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Old 07-09-2013, 02:00 PM   #3
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full maintenance
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Old 07-09-2013, 02:59 PM   #4
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full maintenance
Another one bites the dust
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Old 07-09-2013, 09:39 PM   #5
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The lines for the crankcase vent tend to crank on these engines, causing a pretty major vacuum leak. So check that out. Also the intake boot tends to get dry and rips overtime, causing another vacuum leak. If both of these are fine, try spraying something flammable (brake cleaner works great) around your intake gaskets while its running. You'll hear the engine hiccup a bit of the gaskets are bad. I know this sound unsafe, blah blah blah. But brake cleaner evaporates extremely fast. I've done this for years and have had no problems. If none of these seem to be the problem, turn to fuel. Check your fuel pressure at the rail. If pressure is low, the most common problem is the fuel pump. But for lean mixtures, it's almost always a CCV problem or intake problem. Let me know what you find
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Old 07-09-2013, 10:30 PM   #6
AjiiE46
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full maintenance
What does that mean?
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Old 07-09-2013, 10:31 PM   #7
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I'm going to check the boots and try cleaning the MAF. The air filter was pretty dirty when I checked it last, I'm going to get a new filter too. Hopefully I don't have to replace the CCV.
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Old 07-09-2013, 10:32 PM   #8
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What does that mean?
That means click on the links in my sig and you'll never experience a problem.

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