yellowvwthing

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I have a 95 4runner with a 3.4 in it. The cat smells on warm up, is it bad or one or both of the O2 sensors? If I relace the 02 sensor shopuld I do both? No one carries the rear 02 sensor in stock so it seams like they are not often replaced. Also, my cat does not rattle.
Thanks

MMA_Alex

what does it smell like? sulfur?

yellowvwthing

Yes, it smells like sulfur

celica

is it a 95 with the 3.0 or a 96 with the 3.4? Did you do an engine swap in the 95? If it is the 95 3.0 there is only one O2 sensor.

MMA_Alex

if it smells like sulfur the cat is probably done for