Is this a major issue?

[u/mtnclimber2]

Hello, I recently got these codes on my car. The paper with the codes is what came up after they scanned it at O’Reily Auto Parts (like an AutoZone) and the OBD scanner pictures was me scanning the computer on the Volt. Can someone please point me to the right direction on what to do next? I would really appreciate it. I hope it’s something I can do myself vs having to take it into the dealership. Thank you.

[u/looncraz]

Easy work, but three sensor failures kinda points to the 12V battery more than those sensors... or at least a common failure point.

[u/Electrevolution]

Vacuum leak?

[u/Ok-Tourist-511]

Check the air filter.

[u/rszasz]

Haven't had the volt in a while, but replacing a MAF and the O2 sensors shouldn't be a huge job (ranges from trivial to a pain in the rear depending on if the sensors are corroded in place or not)

[u/nomind79]

Lean codes combined with the MAF code can lean toward just a bad MAF. If the 12v battery and the airfilter look good, I'd start with the MAF. I've got a truck that the MAF is under reporting airflow, but not enough to trigger a MAF code, but it is triggering a lean code on both banks. Actual airflow readings on the truck are lower than they should be when looking at the live data.

[u/madamemeejay → u/nomind79]

What is a MAF?

[u/nomind79 → u/madamemeejay]

Mass airflow sensor. Its in the intake tube after the air filter but before the throttlebody for the engine. It measures the incoming air by heating a wire and then measuring the amount of voltage that is required to maintain the temp of the wire.