Hi! i have a 92 sc300. how many 02 sensor does the car have and where era they located. im trying to replace the rear 02 that has 4 wire (base on the dealer info ). i found 2 sensor came off from the header. it has single wire. i can't find the one that has 4 wire. so help me out

 

only the newer models (i think 95+) has the third o2 b/c mines a 93 and i only found 2 as well on the headers...

 

check under the car after the catalytic conveter. All of them have 3 sensors two of them on the headers and a third after the cat so it can monitor cat efficiency.