Hi gys i am new here and have trouble with my 2004 civic lx two door car
It has a code P0134, O2 sensor no activity, bank one sensor one
I replaced the upstream oxygen sensor with new denso sensor the same one that the car had.
The check engine is still there shows the same code as i indicated above
no change happened when I put in a brand new oxygen sensor, it just behaves like nothing been done at all.
The car about 1,5 months ago suddenly shuddered and tried dying like the dashboard gauges all flashed their needles erratically and then everything came back normal again
about a week ago the car did absolutely the same thing again
also the idle is not always good the engine would idle just fine and then would shudder some like kind of losing it and again will come back to normal idle
it does this kind of thing all the time every 30 seconds to 2-3 minutes it would worsen the idle shudder somewhat and again smooth out
when i drive about sixty five or higher it would like lose power for a moment and again have it back which feels like slight jerking it can do it on some drives almost all the time and on some drives not at all
spark plugs are fine looking good NGK still have life to go.
good spark on all plugs
My suspicion is the ECU, but I would listen to experience and expertise gladly,
thank you for any input you can help with