I pulled both codes for a hi/lo flow on EGR and a rear 02 code, i just replaced my plugs, all coils are up to par, has anyone had this problem? any suggestions?

my EGR and my rear O2 are both out on my car too thats weird you have the same prob. I looking for an answer also
ANYONE?

damn, yea this is also on a fresh set of 02 sensors i replaced both with new bosch direct fits in december, cant figure out why every 300 miles it will trip a rear 02 code?? ill try cleaning out the EGR and see if that helps but i cant see one affecting the other

The rear O2 monitors the catylist efficiency. If the sensor is OK, wiring checks out good, then your cat is no longer functioning as it should be.

When i say rear i mean the bank 2 o2 sensor. not the rear catalytic converter sensor

dude u need to clean the egr tube.. its probably solid like on most maximas...

anybody got a write-up on cleaning the egr tube? I also need to do mine.

^^^^ should be in that sticky-***-place.

ya I looked but couldnt find anything about it.

B2S1? The EGR system shouldn't affect that O2 at all (re: CELs). The codes for that sensor are purely to see if it's working, nothing to do with what it sees.

Search for cleaning the EGR, there are a bunch of threads on it. Ex: http://forums.maxima.org/showthread.php?t=219204

Yea B2s1, ive reset the computer twice now and in about 200-300 miles both codes will pop up. I was curious if one would cause another, perhaps it was a high flow situation it would cause inaccurate o2 readings since it pulls gas from the rear exaust manifold in theory. I wont know for sure till i clean out the EGR and go from there, Thanks for the reply advice though.

will do, preciate it guys, ill report back and see if this fixes both codes