Hello, could you please share me some information? I bought a civic 2004 D17A1 a few months ago with the code P0134 and I replaced the o2 sensor with a new one (NAKAMOTO brand) so I delete the code and it works perfectly for 30 or 40 minutes using the car, then the check engine light turns-on, and I have two new codes P0420 the catalytic converter isn't functioning efficiently and P2A00 related with o2 sensor performance. My question is if Can I buy a Walker upstream o2 sensor? Is it work? Is it reliable? Currently I am looking for a Denso o2 sensor but is too expensive, I would have to import it to my country. Thank you in advance if you know how to solve it.

 

Use OEM

 

Thank you.

 

It may take a drive cycle or two before the check engine light comes on. Now is this the upstream sensor or downstream sensor that was replaced?
Not all O2 sensors are the same. The upstream O2 sensor is an air to fuel ratio sensor or wide band sensor. The down stream O2 sensor is and efficiency sensor or narrow band sensor.