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Old 10-05-2012, 09:16 PM   #1
Weedycamel
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Question LEAN Bank 1

Hi everyone can someone please help me. I have a 2000 E46 and I have the code p0171 coming up. I have a few plans on how to fix thanks to all the threads on this site. What I want to know is this: P0171 is lean bank 1 and P0174 is lean bank 2. My car only says p0171 does that mean only bank 1 is the issue or does it mean I dont have 2 banks and the code refers to all of the cylinders
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Old 10-05-2012, 09:25 PM   #2
tomoyer
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Bank 1 is usually cylinders #1-3 and Bank 2 is usually cylinders #4-6. In New Zealand, do you have O2 sensors?
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Old 10-05-2012, 09:25 PM   #3
jfoj
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P0171 = System Too Lean Bank #1 (Cylinders 1-3).

Note, just because you only have this code, does not mean the entire engine is not running too lean.

Without being able to read fuel trims and getting more data, it is hard to tell if your have more of a issue that may be impacting the entire engine.

Assuming you really only have P0171, then you either have a vacuum leak impacting the front 3 cylinders, which is possible, however, unlikely. Or you may actually have a fuel pump issue. The fuel rail enters from the rear of the engine, so fuel delivery could possibly be an issue as well.

I would start with sorting the typical vacuum leaks then move on from there.

See the first 2 links below in my signature.
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Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose fan switch O-ring - BMW #13621743299
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Old 10-05-2012, 10:14 PM   #4
Weedycamel
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Is it possible its only a 4 cylynder motor so p0171 is actually all banks in one code seen as I dont have 2 sets of 3?
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Old 10-05-2012, 10:17 PM   #5
jfoj
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If it is a 4 cylinder engine, then it is most likely Cyl #1 & #2, however, you need to find out how many O2 sensors are on the engine. Likely 2 O2 sensors, not sure you would have the post-cat O2 sensors like we have here in North America?

You can probably check www.realoem.com if you are unsure, it should show you how many O2 sensors the engine has.
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Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose fan switch O-ring - BMW #13621743299
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Old 10-05-2012, 10:28 PM   #6
Weedycamel
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Thanks! ill do so when I get home, i just saw a few forums that say my model doesnt show p0174 as it only has one bank but ill check your link to be sure
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Old 10-05-2012, 11:38 PM   #7
Weedycamel
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Quote:
Originally Posted by jfoj View Post
If it is a 4 cylinder engine, then it is most likely Cyl #1 & #2, however, you need to find out how many O2 sensors are on the engine. Likely 2 O2 sensors, not sure you would have the post-cat O2 sensors like we have here in North America?

You can probably check www.realoem.com if you are unsure, it should show you how many O2 sensors the engine has.
So if it has 2 o2 sensors does that mean it has 2 banks?
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Old 10-06-2012, 06:01 AM   #8
jfoj
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Yes, meaning 2 - 02 sensors at the output of the cylinder head somewhere dividing the engine into 2 banks typically. Bank #1 usually the first half of the cylinders, then Bank #2 is the last half of the cylinders. The issue is we have very few 4 cylinder cars in the US, or at least that I have personally seen.

US 6 cylinder cars have a total of 4 - O2 sensors, 2 pre catalytic converter monitoring 3 cylinders each and then 2 post catalytic converter measuring each catalytic converter performance as there are 2 catalytic converters, one for each bank or half of the engine. The US cars are split into 2 banks of 2 sensors. Sensor #1 being pre catalytic converter and sensor #2 being post catalytic converter.

Not all regions of the world have post catalytic converter O2 sensors from what I have seen.
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Solve your misfires, lean codes, rough idle - http://forum.e46fanatics.com/showthread.php?t=897616

Fuel pump failures - http://forum.e46fanatics.com/showthread.php?t=929501

Temp Info - http://forum.e46fanatics.com/showthread.php?t=964491

Hidden OBC Menu - Check Voltage, Temps, Fuel Level - http://forum.e46fanatics.com/showthread.php?t=239619

E46/E39 GM5 Door Lock Info - www.bmwgm5.com

Lower hose fan switch O-ring - BMW #13621743299
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