Hey,
I was going to replace my oxygen sensors so I called up Autozone to get a price. They were asking me if I wanted an upstream or downstream O2 sensor. What is the difference between them? Which one do I need?
I was going to replace my oxygen sensors so I called up Autozone to get a price. They were asking me if I wanted an upstream or downstream O2 sensor. What is the difference between them? Which one do I need?