How many o2 sensor do our t4r have???

[99Yotarunner]

hey guys sorry for the dumb question, im replacing my upstream o2 and wondering there are only 2 sensor right one befor and one after the cat right....? A friend is telling me there should be 2 upstreams but i am not seeing one. any input would be great thanks guys

 

[RS Dude]

Only 2 sensors, one before and one after the cat. Both are the same part #.:witch:

 

[Nelsonmd]

They have 18 and need to be replaced every 6 months...

 

[99Yotarunner]

haha very funny!! lol yeah i just looked again there are only 2 like i thought. i have cali emmisions so my part numbers are not the same. and there not cheap...lucky got them from amazon.com way less then parts store wanted

 

[TheDurk]

The 4th Gen V8 has 4 sensors, 2 before and 2 after. Your friend may not know his 3rd Gens from his 4th Gens.