I took my car to a shop 3 times they replaced the senor for the Barometric manifold and the shop gave up on trying to fix the problem. The check engine light still comes on and reads both codes when scanned.
The PO107 code reads low voltage and the PO 108 code reads high voltage. Dose anyone have any idea what might be going on? I have a chevy HHR 2,4L with 79000 miles

 

Welcome to the site, seeing as they already replaced the MAP sensor then the next step is to inspect the wiring harness , look for a bent pin at the connector, follow the ground wire , is that connected clean and secure? Is the o ring damaged? I know it’s new but it’s plausible.
Is the intake manifold damaged, where the sensor is mounted to it?

 

Are those the ONLY codes? No P0641 or P0651?

If not, you need to check the continuity of the 3 wires between the MAP sensor and the ECM. That is MAP not MAF. I assume a "senor for the barometric manifold" means MAF sensor was replaced, I have never heard that nomenclature before.

Probably the bundle of wires is bent and broken somewhere, so that the 5v ref and the low ref wires can touch.

 

The codes both pertain to voltage issues with the MAP sensor