[The Original Hewitt]

2010 Malibu LT 2.4. 147k miles. Recently replaced the throttle body, exhaust manifold, up and downstream O2 sensor, Catalytic converter, exhaust flex hose, catalytic converter, MAF, and all associated gaskets with previously mentioned equipment. I am now getting a P0171 code and everything in my code reader shows as passing. Any ideas or suggestions on what this could be?

 

[Drunken Elvis]

OBD-II DTC: P0171 System Too Lean (Bank 1)

 

[The Original Hewitt]

OBD-II DTC: P0171 System Too Lean (Bank 1)

Any recommendations since I’ve pretty much replaced everything?

 

[DrivenDaily]

Have the injectors been cleaned or diagnosed for proper action?

 

[repairman54]

Did you use AC parts ? Aftermarket like Duracrap are not reliable electrical parts and I've had bad parts out of the box making me crazy. Learned that a long time ago.

 

[Odano1988]

I had to replace my engine because I threw a rod. When engine got replaced I had p0171 went the route of maf,map, O2, built my own smoke test, all that fun stuff. Eventually replaced the fuel injector and that got rid of my p0171.

 

[SouthTexas]

2010 Malibu LT 2.4. 147k miles. Recently replaced the throttle body, exhaust manifold, up and downstream O2 sensor, Catalytic converter, exhaust flex hose, catalytic converter, MAF, and all associated gaskets with previously mentioned equipment. I am now getting a P0171 code and everything in my code reader shows as passing. Any ideas or suggestions on what this could be?

The intake manifold could be loose. Bolts loosen over time. Engine sucks air and pcm throws that code. Tighten bolts, end problem.