Deegee

iTrader: (1)

Hi

I have a 92 sc400 and I'm wanting to replace the o2 sensors but don't know which ones to purchase. I know there are four in the sc4 but wasn't sure if they were four different part numbers or two different pairs.

Also, if there is a DIY on how to replace each one that would be helpful.

I'm on mobile and having some trouble with locating the right threads, links would be appreciated. Thanks CL.

t2d2

iTrader: (8)

http://www.lexls.com/tutorials/EFI/m...gensensor.html

The two upstreams are the same and the two downstreams are the same, but the downstreams aren't likely to need attention.

Deegee

iTrader: (1)

MUCH appreciation!! What makes you say the downstreams aren't likely?? My SC has 212K miles

t2d2

iTrader: (8)

The downstreams don't do much as I recall, other than tell the ECU that they're there. As a result, they seem to last much, much longer.