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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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Old 05-27-2015, 05:54 PM
johnpark johnpark is offline
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Location: Indiana
Join Date: May 2015
Posts: 1
Mein Auto: Indiana
I need help with code PO174 bank 2 too lean

Hi guys I have 2003 325i, this is my first time posting here and I know there is a lot of solution out there about this specific code. But I just wasn't sure which one was the right solution in order to fix it. First of all the SES code came up randomly one day whenever I was driving down the highway and I checked at autozone and it said it was PO174 bank 2 lean. I have cleaned the mass airflow sensor, cleaned out the fuel system with "gumout/ expert series fuel system treatment",did not checked the vacuum hoses since I wasn't sure if its either the air intake or the fuel problem..... My car seems to loose power from a cold start whenever I am trying to drive around.. Is there any solution for this situation?
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Old 05-28-2015, 05:15 AM
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Scott ZHP Scott ZHP is offline
We want the Lion!
Location: PA, USA
Join Date: Jul 2003
Posts: 7,768
Mein Auto: 03 ZHP, 01 X5, 73 MGB
Might want to use the search function. This has been asked dozens of times. A lean condition is caused by either too much air, from a vacuum leak, or too little fuel. Fuel issues could be a clogged/dirty fuel filter of a failing pump. It can also be caused by a failed MAF that incorrectly calculates the volume of air; and no amount of fuel trim will resolve this. Clogged cats and excessive exhaust back pressure can also cause this code.

Originally Posted by Fast Bob View Post
JUST...LOOK...UNDER...THE...CAR....for Chrissakes....it`s like checking to see if a dog is male or female....
Originally Posted by smolck View Post
A bimmer with forced induction should have a proper manual gearbox. Anything less is like french kissing your sister.
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