both cats need replacement. all O2sensors are good. 回复：前几天的问题, O

来源: 于 2009-10-11 19:58:44 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

specification reading for downstream Oxygen sensor (rear O2 sensor ) should be close to 450 mv sin shaped waveform ( normal spec. 420-480mv ) if converter is good ( efficient ).