I got the code P2631 and I switched the O2 sensor with a new one. When first installed the light went away, but after 20 or so minutes it came back on. What could cause this? Is it the sensor I bought is bad or something else. I have a 2004 Acura tl.

 

which sensor did you change, there's 4. BANK 1 and 2 upper and lower.

 

It was bank 2 sensor 1

 

so, you still get the same code after you changed sensors?
did you unplug negative battery cable for a minute or two, afterwards?

 

My buddy who is a mechanic changed it for me and he gets the same code. He has worked on my TL before so I trust he knows what he is doing

 

Whats the brand o2 sensor that was used?
Was an OEM one used?

 

It was a denso sensor

 

Put the "used" suspected bad sensor into upper bank 1 position and see if a code follows. Think it should be P2628-Oxygen Sensor Pumping Current Trim Circuit High Bank 1 Sensor 1.
After replacement, if no code indicating bank 1 sensor 1, it's not a sensor problem, but if the above code follows the sensor, then it is a bad sensor.

 

Has a mechanic friend that 'knows what he's doing'



comes on a forum to ask for help