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Old 04-28-2010, 10:24 PM   #1
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Default lean bank 1 lean bank 2 code 171 & 174

Clear the codes and drive for 10 min-park and then on restart codes come back saying lean bank 1,lean bank 2.my tech says there's no leak after MAF.Has K & N so more o2 getting to TB and PCM is still showing lean.Right now PCM is showing 24% adjustment.What can be done to get the right mix so I don't go
through o2 sensors every 6 months?Need help
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Old 04-29-2010, 05:49 AM   #2
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Get it tuned...
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Old 04-29-2010, 07:54 AM   #3
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Over oiled k&n could contaminate MAF and skew the readings. Do the MAF readings make sense or are they low? Maybe try swapping a known good MAF.
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Old 04-29-2010, 11:54 AM   #4
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What else is done to the car?

A drop in filter alone should not require a tune, nor would it cause the trims to peg and throw lean codes...

Exhaust leaks?
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Old 04-29-2010, 12:38 PM   #5
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Quote:
Originally Posted by Mike@Diablosport View Post
What else is done to the car?

A drop in filter alone should not require a tune, nor would it cause the trims to peg and throw lean codes...

Exhaust leaks?
Depends what car it is - alot of these new cold air kits will do exactly that at idle... He needs to provide more details...
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Old 04-29-2010, 03:03 PM   #6
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Agree, need more details on the car. Lean on both banks could be fuel pressure, PCV, vacuum leak, etc.
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Old 04-29-2010, 10:17 PM   #7
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Is the 24% correction at idle, accel, cruise or all. If correction goes down off idle, I would lean hard towards a vac leak. More info will get you better help.
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Old 04-30-2010, 01:03 AM   #8
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I guess he means LTFTs. Are there driveability issues? If there was insufficient fuel pressure or volume you would have driveability issues especially at WOT. You have to look at what is COMMON to Banks 1 and 2. A vacuum leak at the intake(gasket or hose)? A faulty MAF usually under reports airflow not over reports(lean). Multiple stuck injectors on both banks(not likely)? Fuel filter(maybe and worth checking). How do the STFTs look? Are they switching at 450mVdc?
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Old 04-30-2010, 01:44 AM   #9
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Air leak in exhaust headers ahead of or in vicinity of front O2S's.
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Old 04-30-2010, 07:42 AM   #10
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From what I have seen after re-tuning ALOT of local shops cars, is that when the car has not been tuned properly, the customers seems to go thru alot of 02's and sets the the lean codes as well. Once I get the VE table back in line, I usually install a new set of 02 sensors and all is fine. Get the car tuned properly with a wideband, and install new 02's, and double check all your connections for vacuum leaks. Cammed cars with headers, sometimes the sensors are slow,lazy, depending on where the manufacturer placed the sensors as well.
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Old 04-30-2010, 05:32 PM   #11
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I was having the same problem. Ended up being a cracked intake manifold. Had to hook it up to a smoke machine to locate the leak.
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Old 04-30-2010, 07:09 PM   #12
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Not everyone has a smoke maching do to the cost. You can use your scan tool and watch the STFTs while spraying. When you see the STFTs change(go lean due to extra air getting in) look closer at this location. The STFTs will react quicker than you will see a increase in RPM unless it is a big leak.

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Old 05-01-2010, 02:57 PM   #13
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Yeah I hear ya on the smoke machine. I tried everything I could think of and hardly drove my car for several months. Cleaned the MAF, replaced the MAF, replaced the front O2 sensors, used starter fluid to try and find a leak, etc. Finally, I took it to my tuner's shop. He charged me two hours labor for finding the leak, repairing the intake manifold, changing out the plugs (they were fouled), and retuning. He even sent me video of the smoke machine operating and the location of the leak at the back of the intake manifold. All for less than $200 (including the new plugs). I wish I had just gone ahead and spent the money with him months ago.
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Old 05-01-2010, 03:56 PM   #14
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Default lean bank 1 lean bank 2 code 171 & 174

Loop Status Closed loop
ECT sensor 94* c
Long term ft bank 1 24%
Long term ft bank 2 24%
Engine speed 795 rpm
Spark 13*
MAF sensor 6.42 g/s
HO2S bank1 sensor 2 120 mV
Engine run timr 00:00:51
Fuel tank level remaining 23%
Distance since DTC cleared 56 km
BARO 101 kpa
Ignition 1 signal 14.1 Volts
Ambient air temp 3* c
Engine load 18 %
Short term ft bank 1 1 %
Short term ft bank 2 4 %
MAP sensor 32 kpa
Vehicle speed sensor 0 km/h
IAT Sensor 32* c
HO2S bank 1 sensor 1 565 mV
HO2S bank 2 sensor 1 80 mV
EVAP purge solenoid command 0%
Warm up since DTC cleared 2 counts
Fuel tank pressure sensor -.02 kpa
Calc. TWC Temp 499* c
TP sensor 1 indicated position 3%
TP desired Angle 5%
Car is an awesome 06' V LS2 ,tech did smoke test-no leak even though everything points to a leak,swapped MAF and o2's,flushed fuel injectors,cleared codes and they return on 2nd restart.Tech is stumped.Can anyone help unlock the mystery.Thanks everyone
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Old 05-01-2010, 05:25 PM   #15
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What has been changed about the car from stock? Did the codes start coming in after doing a modification? Or just start out of the blue?
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Old 05-02-2010, 10:48 PM   #16
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Default codes

codes came after K & N cleaned and re-oiled.Waited an hour before replacing filter.Bought the car with K & N and everything was perfect.My tech is really stumped that's why even he suggested coming to LS 1 tech and maybe this has been tackled and solved by someone here.
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Old 05-03-2010, 05:52 AM   #17
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Clean the MAF with some sensor safe spray cleaner...
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Old 05-03-2010, 10:09 AM   #18
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When you oil the filter just oil it on the bottom side and barely put enough oil so that the color is still pretty light (barely pink).
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Old 05-04-2010, 05:10 AM   #19
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Engine light went out for about a day after I drove her for about 40 minutes and during the run I floored her from a dead stop.Turned her off and restarted with engine light coming back on.Could this still be a leak?Wouldn't an intake leak show itself hot or cold-or can this be an exhaust leak?
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Old 05-04-2010, 09:31 PM   #20
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Different car, Oldsmobile with a 3800, but I had a lean code P0174 driving me crazy.

Problem turned out to be the PCV valve.

Just throwing it out there.
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Old 05-04-2010, 09:31 PM
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