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smug01 · 12-15-2011, 01:16 AM

Correct. The rear O2 sensor I was referring to is the one right downstream of the primary cat. It is the one that needs the diagnostic...which causes emissions breakthrough of the primary cat.

12-15-2011, 01:16 AM	#24
smug01 Enlisted Member 2 Rep 31 Posts Drives: 1M VO, '97 Land Cruiser Join Date: Oct 2011 Location: Orange County iTrader: (0)	Correct. The rear O2 sensor I was referring to is the one right downstream of the primary cat. It is the one that needs the diagnostic...which causes emissions breakthrough of the primary cat.
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