Just received new O2 sensors for the front and back with O2 spacer for the test pipe. Installed and VAGGED, got this value.
Front Avg. 1.76 Back Avg. 0.41.
After installing new O2 went out for test drive and got several pop from the back. Is this range look normal?? It seems that the rear value is lower than the 1st one so, which indicates the O2 spacer works..