P0171 System Too Lean

[FishmanUK]

P0171 System Too Lean

Got the check engine light on my LS3 VXR8 on the way home from work today. Plugged into the laptop once home as everything seemed normal and got the code above.
From reading around a possible cause is dirty MAF. I installed the VCM OTR intake about 3 months ago now so have taken it off to give the MAF a clean (hopefully) by spraying isopropanol on the MAF.

The throttle body valve was a bit dirty but I imagine that is fairly standard, nonetheless I gave the MAF side of it a bit of a wipe.

Assuming this doesn't fix the problem anyone got any recommendations for what to try next ?

I have the program ODBWiz so can log some data. I guess I need to look at O2 sensors but there seem to be a lot of options !

Thanks for any suggestions

[22BAndy]

Hi, this would normally indicate an air leak on the inlet side after the air flow meter.
Could be a loose or split breather etc, or a gasket / seal split.

hope that helps m8e

Andy

[monkfish1]

If you only have the code on one bank, then it must be a bank specif issue rather than a both babk issuer such as a MAF.

Either dodgy O2 sensor or an air leak on that bank would be the starting point.

[FishmanUK]

I have cleared the code (just this code not the other side also) and it hasn't returned after a couple of short drives so maybe just dodgy sensor issue ?

Will try and get some logging done for piece of mind.

Thanks for the info