2015 Sierra check engine light fuel trim codes

[Cwildman]

Hi, wondering if anyone can help shed some light on my 5.3 issues. The truck has been great so far, had since new. It's only got 40,000km on it. I towed a trailer for about an hr the other day, the next morning I went to remote start it and it wouldn't, I start it manually and find out the check engine light is on. I plug scanner in and find these codes
 
P0131: O2 Sensor Circuit Low Voltage Bank 1 Sensor 1
• P0171: System Too Lean Bank 1
• P2096: Post Catalyst Fuel Trim System Too Lean Bank 1.
 
I did a visual inspection of driver side o2 sensors and everything looked normal, also checked maf sensor.
 
I haven't really done any trouble shooting just visual inspections. My truck has a custom tune, banks intake, bolt on cat back exhaust, 6"lift, basic stuff. It's been run like this since new almost, and just recently decided to throw this code so I don't think the mods are related to the problem.
 
Just wondering if anyone has had the same combination of codes thrown and what they're fix was...truck is going into the dealer on friday, but someone elses first hand experience would be a lot of help but any info is appreciated.
 
Thanks
 
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[lapoolboy]

Bad O2 sensor

[Cwildman]

That's what I'm hoping

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[Cwildman]

Could also be injector too though? Haven't had time to trouble shoot, feel free to post ideas or experiences with injector or o2 sensor problems.

Thanks

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[BPP811]

I just had a service on my Gmc Denali 5.3, had some of the same codes, the tech said my injectors in cylinder 1 , 3, and 8 , were not giving a “ double shot “ when on the start of the vehicle. Your post caught my eye because I had several problems arise in one incident of towing one of my trailers 

I’m not going to change injectors, it just misses a little when it’s cold. 

During this same time my remote start quit working, and my steering wheel heat quit and my  magnaride, front struts locked up. 

I’m very bewildered by all this in so short a time frame.

dealer will put new struts and injectors in service for just 3800 dollars. 

This is on a 2015 Serra Denali 67k miles.

[Cwildman]

I just saw this, thanks for the response, it's definitely helpful. I cleared the code and ran some premium fuel through it, thinking maybe I got some bad fuel. The code hasn't showed up since. But I will definitely refer back to your response if the issue happens again... Thanks!

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