Engine code P0134 on my Suzuki

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Lana

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My car’s been sitting for 6 months, I fired it last week and immediately got engine code P0134: O2 circuit no activity detected bank 1 sensor 1. I cleared the code, but it came back after about 20 minutes, so it’s definitely not going away. I watched a YouTube video suggesting it could be a vacuum leak, but I’m hesitant to start messing with things. Before I dive in, has anyone else experienced this? Any advice or tips would be really helpful...

This is the video, for those who might ask:

 
I’ll check the brake booster for any potential leaks, it seems like a good place to start since vacuum leaks can definitely trigger O2 sensor codes. Appreciate the help.
 
that's a common one after a car's been parked for a while. O2 sensors are super delicate. While a vacuum leak is possible the sensor itself is probably the problem. They get nasty when they sit. Check the wiring for damage first. If that's okay you could test the sensor with a multimeter. But honestly after six months just replace the sensor. It's usually the easiest fix.
 

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