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Old 02-09-2011, 06:46 PM #1
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How Many O2 Sensors
I have a 94 Runner, 6 cyl, 5 speed. How many O2 sensors should there be? I found one pre-cat but can't seem to find any other. Thanks for the help.
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Old 02-09-2011, 09:46 PM #2
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Federal only has 1 O2 sensor, Cali has 1 before and 1 after the cat conv.
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Old 02-09-2011, 10:32 PM #3
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I have a 92 that I bought from the original owner in California, and it was purchased originally from a Toyota dealer in California and it has only one O2 sensor and it is in front of the cat.
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Old 02-10-2011, 01:42 PM #4
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Thanks for the help. I know I'm not going crazy finding only one.
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Old 04-24-2011, 11:59 PM #5
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O2 Sensor
???Hmm, I'm fairly certain 4Runner's have two O2 sensors. One in front of the converter and one behind it.

I could be wrong, but I don't think so.
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Old 04-25-2011, 12:05 AM #6
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I have only 1 and it's California truck.
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Old 04-30-2011, 07:18 PM #7
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My california 93 only has one also. i checked into it and its correct, I believe its a pre OBD2 thing.
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