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Originally Posted by Jake D
The secondary sensors are not monitored? If this is true then why are they there for 1? and why have I seen multiple times on here that when you go to replace a bad O2 sensor to replace all 4 at the same time?
Is this true on my 00 S? or?? Can someone explain please?
Thanks
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The secondary cats are superfluous. The vehicle's OBD monitors the o2 readings from the header/pre-cats. Someone has given you some bad advice.