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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 11-05-2010, 10:45 AM
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henry_desmond henry_desmond is offline
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SES light on w/ codes P0174 & P0171

The Service Engine Soon light just came on and I took it the the parts store and read the codes. They are P0174 system too lean (Bank 2) and P0171 system too lean. I noticed a rough idle when I drove it wednesday, and today the SES light came on as I was driving. The car drives fine but when it is in park it has a rough idle. The idle gets rougher when I put it in drive and have the brake depressed. I actually was scared that it was going to cut off when I was at the stop sign. The guy at the parts store says that it could be the o2 senser (my car does have 102k miles on it). But I have no idea where to start looking. Any suggestions before I take it to the shop? BTW the air filter is dirty, but that wouldn't make the SES light come on would it? Also, I have already checked the gas cap and it is on tight.
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  #2  
Old 11-05-2010, 11:45 AM
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jburns jburns is offline
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When I got those codes I changed the pre-cat O2 sensors and they went away. It's been almost a year later now and the P0174 is showing back up now and then along with a Misfire Cylinder 4 code (can't remember the number). So, I am about to change all of my coils!
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  #3  
Old 11-05-2010, 03:10 PM
genuity genuity is offline
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did you check yout intake boot for any tears? how clean does the idle control valve (small part of intake boot leads to this) look?
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  #4  
Old 11-05-2010, 03:30 PM
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henry_desmond henry_desmond is offline
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Quote:
Originally Posted by genuity View Post
did you check yout intake boot for any tears? how clean does the idle control valve (small part of intake boot leads to this) look?
I just bought some intake cleaner and a new air filter. So I'm going to clean the intake and maf sensor and see if it solves my problem.
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  #5  
Old 11-05-2010, 04:57 PM
genuity genuity is offline
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Originally Posted by henry_desmond View Post
I just bought some intake cleaner and a new air filter. So I'm going to clean the intake and maf sensor and see if it solves my problem.
You might also want to check your DISA:

http://forum.e46fanatics.com/showthread.php?t=576774
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  #6  
Old 11-05-2010, 06:39 PM
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henry_desmond henry_desmond is offline
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Originally Posted by genuity View Post
You might also want to check your DISA:

http://forum.e46fanatics.com/showthread.php?t=576774
THank you! I will look into this also
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  #7  
Old 01-17-2011, 06:50 PM
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henry_desmond henry_desmond is offline
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After I replaced the DISA valve last month the SES light did not come on anymore until yesterday. So, I took the car the Advance Auto parts and reset the light and it stayed off all day yesterday and this morning. But, it did reappear when I cranked the car later on in the day. The codes are P0174 (system lean bank 1 & 2) and P0411 (secondary air/injection sys/incorrect air flow). What could the culprit be???
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  #8  
Old 01-18-2011, 05:51 AM
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Scott ZHP Scott ZHP is offline
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Quote:
Originally Posted by henry_desmond View Post
After I replaced the DISA valve last month the SES light did not come on anymore until yesterday. So, I took the car the Advance Auto parts and reset the light and it stayed off all day yesterday and this morning. But, it did reappear when I cranked the car later on in the day. The codes are P0174 (system lean bank 1 & 2) and P0411 (secondary air/injection sys/incorrect air flow). What could the culprit be???
As already mentioned, check your intake boot carefully. It tears at the accordian pleats and causes air leaks. Or perhaps a clamp is missing. The codes thrown (lean running condition) suggest you have unmetered air leaking in from somewhere. Also check your airfilter, MAF and associated tubing.
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  #9  
Old 01-18-2011, 07:11 AM
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CarlsonTheFlyer CarlsonTheFlyer is offline
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9 times of of 10 P0171 and P0174 codes are caused by a tear/hole/crack somewhere in one of your intake boots or hoses. Can be anywhere between the MAF sensor and the engine. Could also be a leak in the no-return valve, CCV, or DISA valve gasket. These 2 codes are often, but not necessarily, accompanied by P0300 (random/multiple cylinder misfire).
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  #10  
Old 01-18-2011, 08:16 AM
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henry_desmond henry_desmond is offline
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Quote:
Originally Posted by CarlsonTheFlyer View Post
9 times of of 10 P0171 and P0174 codes are caused by a tear/hole/crack somewhere in one of your intake boots or hoses. Can be anywhere between the MAF sensor and the engine. Could also be a leak in the no-return valve, CCV, or DISA valve gasket. These 2 codes are often, but not necessarily, accompanied by P0300 (random/multiple cylinder misfire).
Quote:
Originally Posted by Scott ZHP View Post
As already mentioned, check your intake boot carefully. It tears at the accordian pleats and causes air leaks. Or perhaps a clamp is missing. The codes thrown (lean running condition) suggest you have unmetered air leaking in from somewhere. Also check your airfilter, MAF and associated tubing.
It's not throwing the P0171 code anymore just P0174 & P0411 (secondary air/injection sys/incorrect air flow). So the second code leads me to believe that the problem could be with the secondary air pump. I checked it this morning by unplugging both hoses that connect to the pump and it blow out air with a significant amount of force and it sucked air in. So, the pump is working but in only stays on for like 10 seconds. Could this be a fuse or relay? I also checked the hoses and they seem fine too.
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  #11  
Old 01-18-2011, 10:20 AM
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Scott ZHP Scott ZHP is offline
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Quote:
Originally Posted by henry_desmond View Post
So, the pump is working but in only stays on for like 10 seconds. Could this be a fuse or relay? I also checked the hoses and they seem fine too.
That's normal in cold weather.
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JUST...LOOK...UNDER...THE...CAR....for Chrissakes....it`s like checking to see if a dog is male or female....
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A bimmer with forced induction should have a proper manual gearbox. Anything less is like french kissing your sister.
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  #12  
Old 01-18-2011, 12:03 PM
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CarlsonTheFlyer CarlsonTheFlyer is offline
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Quote:
Originally Posted by henry_desmond View Post
It's not throwing the P0171 code anymore just P0174 & P0411 (secondary air/injection sys/incorrect air flow). So the second code leads me to believe that the problem could be with the secondary air pump. I checked it this morning by unplugging both hoses that connect to the pump and it blow out air with a significant amount of force and it sucked air in. So, the pump is working but in only stays on for like 10 seconds. Could this be a fuse or relay? I also checked the hoses and they seem fine too.
The pump is working, but you probably have a leak in the secondary air system.
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  #13  
Old 01-18-2011, 04:17 PM
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henry_desmond henry_desmond is offline
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Originally Posted by CarlsonTheFlyer View Post
The pump is working, but you probably have a leak in the secondary air system.
where could that leak be? I checked both hoses that run to the SAP and they look good. But, when I did take off the hose going from the SAP to the valve there was some water.
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  #14  
Old 01-18-2011, 05:35 PM
shanneba shanneba is offline
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The next thing to check would be the SAP check valve on the cylinder head.
http://www.bavauto.com/newsletter/20...ter.pdf#page=6
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  #15  
Old 04-19-2011, 09:29 AM
Herbkey Herbkey is offline
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SES Codes

There is a black rectangle shaped box with a check valve on the left side of the engine obove the cold air intake 3" hose ( 2 x screws ). pull it out, there is a butterfly ( looks like a boat sail) check if it's broken. Next below that there is a valve that has 4 hoses connected to it 1 comes from the valve cover ( next to the oil cap ), 1 goes next to the dipstick and the other 2 go elsewhere. Change all 4 hoses and the valve. You must take off the cold air intake box.
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