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2.7. Lean bank 2. Replaced O2, Intake gasket, checked vac leaks. What else?

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O2 impala ls 3.8 bank one lean is what i get when check at advanced auto parts. i have replaced both o2sensors rebuilt the motor from heads up (all new gaskets). and replaced the fuel pump, fuel filter. ...

the upper plenum on those guys are notorious for warping and leaking. they sell an aftermarket upgrade replacement for this engine. check the simple things first, intake boot, throttle plate gasket and fuel pressure. were the injector to intake gasket o-rings changed when you had the top end done? start there good luck sir.

Aug 21, 2013 | 2000 Chevrolet Impala

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Code 1150 on a 1997 ford f 150 with a 4.2 motor

I will try to paste an article for you. Several sources indicate this is a Bank 2 O2 sensor problem and that it is failing to switch and adjust for the fuel mix. But as you can see, many defects can lead up to this O2 sensor Code 1150.

I would try to use a spray bottle of water and go around the Intake manifold and spray the water while the engine is running. An intake leak will draw water into the engine and change RPM.

If no success then try changing the O2 bank 2 sensor. You may need to wipe the computer and clear the Code. H40 DTCs P1131, P1132, P1151 AND P1152: UPSTREAM HO2S NOT SWITCHING. DTC P1130: FUEL SYSTEMicon1.png NOT SWITCHING AT FUELicon1.png TRIM (RICH OR LEAN)
Diagnostic Trouble Codes (DTCs) P1131 bank 1 (Cylinder 1) and P1151 bank 2 indicate the fuel/air ratio is correcting rich for an overly lean condition. The HO2S voltage is less than 0.45 volt. DTCs P1132 bank 1 (Cylinder 1) and P1152 bank 2 indicate the fuel/air ratio is correcting lean for an overly rich condition. The HO2S voltage is greater than 0.45 volt.
DTC P1130 and P1150 indicate the fuel control system has reached maximum compensation for a lean or rich condition and the HO2S is not switching.
DTC/HO2S Reference List
•HO2S-11 = DTCs P1131, P1132 and P1130
•HO2S-21 = DTCs P1151, P1152 and P1150
Possible causes:
Fuel system
•Excessive fuel pressure.
•Leaking fuel injector(s).
•Leaking fuel pressure regulator.
•Low fuel pressure or running out of fuel.
•Contaminated fuel injector(s)
•Vapor recovery system
Induction system
•Air leaks after the MAF.
•Vacuum leaks (vacuum lines and gaskets).
•Restricted air inlet.
•PCV system.
•Improperly seated engineicon1.png oil dipstick.
EGR System
•Leaking gasket.
•Stuck open EGR valve.
•Leaking diaphragm.
Base engine
•Oil overfill.
•Cam timing.
•Cylinder compression.
•Exhaust leaks before or near the HO2Ss.
•Check intake air system for leaks, obstructions and damage.
•Check air cleaner element, air cleaner housing for blockage.
•Verify integrity of the PCV system.
•Check for vacuum leaks. user_online.gif quote.gif post_old.gif )

Mar 28, 2013 | 2003 Ford Ranger Regular Cab

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Bank 1 Too Lean on 2006 Kia Sedona

Use the codes you have to diagnose

Could be a rich condition & computer
is driving fuel trim lean-thus the code

Could be a bad O2 Sensor stuck lean

Could be a vacuum leak & lean codition
as a result

Need a repair shop or lots of studying
if your going to resolve & you can

Mar 02, 2013 | 2006 Kia Sedona 3.8

1 Answer

2000 silverado 1500 4.8 bank 1 and bank 2 to lean how can i fix

I have a 2001 Silverado 1500 with the 4.8 that had the same error codes. It turned out to be intake manifold gaskets were bad. With the engine running spray some carb cleaner on the intake where it bolts up to the heads and listen for the engine to speed up. If it does you've got a leak. With mine I couldn't find the leak with the carb cleaner but after I replaced the gaskets the problem was solved. Hope this helps.

Jan 18, 2012 | 2000 Chevrolet Silverado 1500

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2006 toyota corolla 1.8 sohc p0171 found dirty mass air flow cleaned results the same replaced it 2 days go by and again the same code pops up p0171 fuel fystem too lean bank 1 the down stream o2 is...

Either the mass-air sensor is bad, which normally throws a mass-air voltage code, or you definitely have an air leak post the mass-air. Smoke the intake manifold with a smoke machine or spray the whole intake to head, including to brake booster with brake cleaner and listen for a change in idle. Focus on the gasket surface of the intake manifold.

Dec 15, 2010 | 2003 Toyota Corolla

2 Answers

Tells me that bank (1) p0171 and bank (2) po174 are bad which bank is 1 and which bank is 2

P0171 and P0174 are lean codes. They do not mean the 02 sensors are bad. The most common cause for this especially when both banks are lean is the plenum gaskets in between the plenum and the heads. They will start to leak and cause a vacuum leak. When they leak bad enough it will flag lean codes and eventually the vehicle will start to idle rough and eventually not idle at all.

Replacing the gaskets will usually fix this problem. Sometime the intake plenum will warp and need to be replaced as well. Replacing the O2 sensors will not fix this problem.

Dec 10, 2010 | 2003 Chevrolet Suburban 1500

2 Answers

Running lean

Have you a leak in the exhaust??even a small leak will cause the lambda value to be out check your exhaust

Mar 02, 2010 | 2000 Dodge Intrepid

1 Answer

I have a 2003 gmc yukon 5.3 the engine idles rough sometimes the idle will get so low the engine will shut off.(the engine runs good while driving) hooked to scaner po101 maf/vaf (dont know what vaf is),...

you have a vacume leak somewhere.check all of your vacume hoses for leaks.Injector seals can cause this too.Also intake gaskets could be leaking.Running to lean usually means the car is getting to much air coming in.To check leaks spray brake cleaner around the hoses and the bottom of your intake if the rpms change then you found a leak.

Feb 21, 2010 | 2003 GMC Yukon XL

1 Answer

O2 sensor location 1997 pontiac grand am 2.4 4 cyl auto trans



Jul 13, 2009 | 1997 Pontiac Grand Am

1 Answer

2002 Pontac Grand Prix GTP P0171 code engine stumbling at times

Bank 1 is the frt side exhaust manifold (did they say bank 1 sensor 1?),you can start by replacing that sensor,i would check the intake for leaks ,the gm 6cly. are known for bad intake gaskets,you will see oil coming out form the frt or rear of the intake,also check your atifreeze overflow bottle for bronwish sludge,which means that the oil is mixing with the antifreeze.A leaking intake could cause that lean condition.

Mar 29, 2009 | 1998 Pontiac Grand Prix

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