I am woundering what the true function of the rear o2 sensor actually are. I do understand that they are montoring the cats, but can they actually add or subtract fuel?
I am woundering what the true function of the rear o2 sensor actually are. I do understand that they are montoring the cats, but can they actually add or subtract fuel?
2001 camaro z28 ss vert with factory slp upgrades, Hooker long tubes, 3"y-pipe to a 4" muffler, ,airlid,s.s.r.a. ,t.c.bypass,descreened m.a.f. 232/234 .595,.598 +2 comp cam with ported and polished stock heads with .650 lift dual springs and a bowl grind. tuned with EFI Live. All combined to achieve 29 m.p.g. and 399 r.w.h.p. with 384 lbs of torque. sold...
Now own a 2015 1LE camaro
The purpose of the rear oxygen sensor is to monitor the oxygen content of the exhaust gases leaving the catalytic converter. This gives the emission system a way to monitor the operation and efficiency of the catalytic converters. The rear oxygen sensor checks several things in the post–catalytic converter gases. It measures the amount of oxygen, or peak threshold, in the exhaust gases and follows how fast the amount of oxygen changes. On some vehicles, the rear oxygen sensor is mounted midway in the catalytic converter to measure how efficiently the reduction bed converts NOx by checking the amount of oxygen that is released back into the exhaust flow.
More simply, the rear O2 sensor is not to my knowledge used for adjusting AFR, it is only used to confirm the operation of the CATs.
Ira
2001 camaro z28 ss vert with factory slp upgrades, Hooker long tubes, 3"y-pipe to a 4" muffler, ,airlid,s.s.r.a. ,t.c.bypass,descreened m.a.f. 232/234 .595,.598 +2 comp cam with ported and polished stock heads with .650 lift dual springs and a bowl grind. tuned with EFI Live. All combined to achieve 29 m.p.g. and 399 r.w.h.p. with 384 lbs of torque. sold...
Now own a 2015 1LE camaro
Do note that this is an abnormal condition.Originally Posted by GM Service Manual