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fiasco88
04-13-2002, 09:08 PM
Which 02 sensor is the primary? Which is seccondary? Before cat or after cat??? Which is which?

Toda Party
04-13-2002, 09:11 PM
pri - the one in the header's collector
secondary - on the cat

NOINTEGReddy
04-15-2002, 01:04 AM
Isn't the secondary to see if the cat is doing it's job (for OBD-II). Hence why it is placed at the end of the cat.

Toda Party
04-15-2002, 11:50 AM
yes