P0174 system bank 2 too lean, air filter

coffeebob · 05-13-2017, 12:52 PM

I got "Service Engine Soon" yesterday while driving. Pepboys pulled the P0174 system bank 2 too lean. Then I checked the geniune nissan air filters. Both were quite dirty, stuff trapped by the oily filter, and have some leaves on the filter and inside the air box. After shaking and picking out the obvious dirt, light still on. After getting gas & adding chevron injector fluid, slight still on.
But after making a coffee stop, the light went away.

I replaced the air filter not too long ago, may be 25k ago. While it got dirty and clogged so frequently. I don't recall chaning my air filters so frequent in my previous 2 cars (1990 integra, 2002 325i).

thanks.

Nixin · 05-13-2017, 01:08 PM

What kind of coffee does your Z like? My Z loves 'espresso'.

Throw in some K&N air filters or drop in a Z1 CAI. It will do wonders for your Z.

coffeebob · 05-13-2017, 01:12 PM

ethiophian harra

Nixin · 05-13-2017, 01:17 PM

Nice!

coffeebob · 05-19-2017, 01:42 AM

The light came back on after 3 days. still on after I received and installed new air filters today. Does it take some miles, some time for the computer to recognize?

SouthArk370Z · 05-19-2017, 07:23 AM

Go buy a cheap OBD tool and reset the PID. P0174 is often caused by a dirty/oily MAF, so it will probably keep popping back up until you clean your Bank 2 (left/driver's side) MAF. It's a very easy job (several DIYs on this site), so go ahead and clean both MAFS.

05-13-2017, 12:52 PM	#1 (permalink)
coffeebob Base Member Join Date: Feb 2014 Location: coffeeland Posts: 42 Drives: coffee grinder Rep Power: 11	P0174 system bank 2 too lean, air filter I got "Service Engine Soon" yesterday while driving. Pepboys pulled the P0174 system bank 2 too lean. Then I checked the geniune nissan air filters. Both were quite dirty, stuff trapped by the oily filter, and have some leaves on the filter and inside the air box. After shaking and picking out the obvious dirt, light still on. After getting gas & adding chevron injector fluid, slight still on. But after making a coffee stop, the light went away. I replaced the air filter not too long ago, may be 25k ago. While it got dirty and clogged so frequently. I don't recall chaning my air filters so frequent in my previous 2 cars (1990 integra, 2002 325i). thanks.

05-19-2017, 07:23 AM	#6 (permalink)
SouthArk370Z Premium Member Join Date: Nov 2010 Location: South Arkansas Posts: 8,435 Drives: 2014 Challenger Rep Power: 324198	Go buy a cheap OBD tool and reset the PID. P0174 is often caused by a dirty/oily MAF, so it will probably keep popping back up until you clean your Bank 2 (left/driver's side) MAF. It's a very easy job (several DIYs on this site), so go ahead and clean both MAFS. __________________ Steering Lock Links - Search The370Z Bookmarklet - FSM @ NICOclub Mankind has progressed past the need for war but we haven't evolved that far. - NachoMahma

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
P0171 and P0174	Z_ealot	Engine & Drivetrain	11	02-20-2016 07:12 PM
Service Engine Soon - P0174	Vaibe	Engine & Drivetrain	6	03-03-2015 12:09 PM
Po174 bank 2 lean	Elmo370z	Engine & Drivetrain	2	12-13-2014 09:45 PM
Fuel system running lean on bank 1 & 2	Icebrand	Engine & Drivetrain	13	06-16-2014 08:35 PM
M7 Japan T-Titan Exhaust system / Power Filter Intake	Moore Auto	Moore Automotive	0	03-05-2013 12:11 PM

05-13-2017, 01:08 PM	#2 (permalink)
Nixin A True Z Fanatic Join Date: Sep 2015 Location: GWN Posts: 3,488 Drives: Goodbye Z! Rep Power: 19833	What kind of coffee does your Z like? My Z loves 'espresso'. Throw in some K&N air filters or drop in a Z1 CAI. It will do wonders for your Z.

05-13-2017, 01:12 PM	#3 (permalink)
coffeebob Base Member Join Date: Feb 2014 Location: coffeeland Posts: 42 Drives: coffee grinder Rep Power: 11	ethiophian harra

05-13-2017, 01:17 PM	#4 (permalink)
Nixin A True Z Fanatic Join Date: Sep 2015 Location: GWN Posts: 3,488 Drives: Goodbye Z! Rep Power: 19833	Nice!

05-19-2017, 01:42 AM	#5 (permalink)
coffeebob Base Member Join Date: Feb 2014 Location: coffeeland Posts: 42 Drives: coffee grinder Rep Power: 11	The light came back on after 3 days. still on after I received and installed new air filters today. Does it take some miles, some time for the computer to recognize?