P0171

[sonic2013ltz]

On 5x or so times that I have repaired the 1.8 2012-14 Auto with 90k miles +OD .. CEL light is on. Using the scanner you have found that there are Live Data that have not enough to giving you to go with. The short and long fuel at a little (-/+ 1.x to 2.x %) but hard to figure what sensor (MAF at 2.5 v) or a thing to go and check. Each time FOR ME have been the oil cap or the dip stick o-rings gone bad.

 

[skurtov]

On 5x or so times that I have repaired the 1.8 2012-14 Auto with 90k miles +OD .. CEL light is on. Using the scanner you have found that there are Live Data that have not giving you enough to go with. The short and long fuel at a little (-/+ 1.x to 2.x %) but hard to figure what sensor (MAF at 2.5 v) or a thing to go and check. Each time FOR ME have been the oil cap or the dip stick o-rings gone bad.

wat.

 

[Z71]

P0171 code mean lean running engine, sometimes one bank only on a V6 or V8 engine. Usually it is a leaky vacuum hose causing this. In case of my sonic it was the defective MAF hose which was redesigned by GM. However, I experienced the same code on other vehicles due to a leaky or disconnected vacuum hose.

Lean or rich code can also be set by a malfunctioning O2 sensor, usually the one before the catalytic converter. I had this issue with my Impala, I got rich running engine code repeatedly. Replacing the O2 sensor ahead of the converter fixed the problem for good. it was just a lucky guess on my part as my code reader listed several general reasons for the rich running engine.

 

[sonic2013ltz]

I do understand that they are numerous reasons that happen. The 'china syndrom' intake air hose were a problem. The trims from the scanner are for finding the set code not necessarily looking for 'lean' in particularly. Scanner o2? Volts up on down for instance, finds a sensor . This was a problem that is not easy to find. The air hose thing have been repaired for most of the early years and all over youtube. This has been most on the 100.000 +\- OD's with really odd P0171. That are NOT the scanner 'date live' info that can point to a sensor that are slightly out of whack. Using the VM is not showing o-rings and people throwing money at a purge or MAF(and carb cleaner) can save some bucks and time checking these 2 that i mentioned. You can start with a plastic bag or rubber plug to start with. Many have PVC internals repairs (big money) that have been put back the oil cap and dipstick to find the code back again.

 

[skurtov]

You blew the PCV valve in the intake manifold.