2004 Honda Civic with 166000 miles.
–Had Check Engine light on for a couple days and code reader said P0135. Parts guy said this means “Bank 1”, my Haynes book calls this code for " Primary Sensor 1" Is this the same as “Upstream”?
–Replaced O2 sensor (Denso 192400-1160 05F12) myself with a new one (Bosch 15710). Fit perfectly, plugged right in.
–Check engine light goes off for about 5 minutes but comes back on with code P0134.
What should I do now? I replaced the sensor closer to the engine before the catalytic converter. Very easy to reach from the top. I rented the correct tools and did not damage or force anything. Is there a second O2 sensor after the cat that is not so easy to reach? Was that the one I needed to replace? Did I misunderstand the meaning of “upstream” or “Bank 1”?
Thank you for your help in advance.