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Discussion Starter · #1 ·
So I just bought a used wrx a day ago and was putting gas but didn't know what gas was already in the tank, I asked the salesman and he just said premium and didn't really understand me so I put 93 octane, after I did I had got a check engine light, the car came with a Cobb access port and I don't know anything of how to use it but I was able to find out how to read codes and it gave me, PO137, which I looked up meaning that it's a low voltage o2 sensor, but I don't know what to do from there or if it's even a real issue or not PLEASE HELP
 
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