How many oxygen sensors are there on a 1990 300zx tt?

The Nissan 300ZX (Z32) general community discussion forum
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x300zxturbox
Posts: 40
Joined: Tue Mar 06, 2007 2:52 pm
Car: 300zx

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and on what side and before or after the cat?

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tmeyer29
Posts: 848
Joined: Sat Mar 03, 2007 6:40 pm
Car: 1990 300zx TT , 04 Yamaha R6

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i dont know for sure but my guess is... one before each cat...I doubt there would be one after..that mostly started in 96 when all cars had to have obdII
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nsrZ32
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Joined: Fri Oct 15, 2004 8:27 am
Car: 90 300ZX TT, 78 280Z, 71 521 Pickup, 98 Sentra 2.0 SE, 02 Altima 3.5 SE, 01 Focus s2
Location: Ohio
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90-95 = two pre-catalyst o2 sensors

96 = four o2 sensors, two pre-catalyst, two post catalyst
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