po141 code

im getting a p0141 code on my 97 se 2.4. book says 02 sensor heater circuit bank 1 sensor 2. is this the downstream sensor? also getting a 304 code, so which one is cylinder 4?

p0141 is the down stream(one after cat) O2 sen heater circuit malfunctioning.
Check the wiring for damaged, but you might hav to replace the O2 sensor anyway.


Standing in front of the car the firing order is like this,
1 2 3 4, so four is on the drivers side.

For the misfire, try some high quality injection cleanr.
I've been using Lucas oil injection cleaner and my misfires havnt poped up since.
But any concentrated injection cleaner would work, like STP or Gumout (name brands), I wouldnt waste money on the cheap stuff, you get what you pay for.