Review on 🚗 DOICOO Oxygen O2 Sensor 234-4012 2344012 19178918 25312184 - Compatible with Chevy Silverado Tahoe Express Blazer C1500 C2500 C3500 K1500 K2500 Lumina APV GMC Savana Yukon by Mark Vazquez

No wonder they cost twenty dollars instead of nearly $60 at a local parts store. You are not working. In addition to a P0420 code telling you that you need a bank A oxygen sensor, installing this oxygen sensor will show a code P0420 and a code 0134 stating there is no information from the oxygen sensor. So when you install this thing and think that you're going to go through a few drive cycles and your service engine light goes out and you throw away the original packaging for this thing and can't return it, you realize that this thing doesn't work at all and over nothing, does not send any information to the computer. Useless piece of junk that proves you get what you pay for. But in this case, you don't even get what you pay for.