I recently replaced an O2 sensor upstream and reset the code. Everything was good. A few minutes later the other upstream sensor and the down stream sensor on the same side are showing bad. I replaced the upstream sensor and it still shows partly bad. Any ideas?

 

Welcome to DF. First, before we can even begin to help you, we'll need your auto's make, model, model year, trim level, if a pickup or SUV: 4x4 or 4x2, etc. etc. The more info you can give us, the better.

After you provide that info, I can move this to the appropriate section. This section is for personal computer (PC) issues, not auto ones.

I know many cars do not like the cheaper, poor quality Bosch or Standard brand sensors, which are usually the most commonly found (because they are the cheapest). The best brands are NTK (same company as NGK) and Denso, which were at different times the OEM sensor manufacturers, depending on which car/model year you own. Rock Auto is the best place (and provides quick shipping) to find these and get the lowest price possible.

 

Thanks for redirecting me to the correct place. It is a 2000 Dodge Intrepit RT with Magnum engine.