Oxygen Sensor ???
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Oxygen Sensor ???
Hey,
I was going to replace my oxygen sensors so I called up OReillys to get a price. They were asking me if I wanted an upstream or downstream O2 sensor. What is the difference between them? How do I know which one I need?
1994 LS 400
200K +miles
I was going to replace my oxygen sensors so I called up OReillys to get a price. They were asking me if I wanted an upstream or downstream O2 sensor. What is the difference between them? How do I know which one I need?
1994 LS 400
200K +miles
#2
Super Moderator
Downstream O2 sensor usually refers to one after the main catalytic converter underneath the vehicle. However, if you are replacing the ones in the engine area, those are also called a/f (air/fuel sensors) and are upstream. If you're looking to fix gas mileage issues, then the a/f sensors are the ones you are looking to fix.
#4
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Looking up your vehicle with Denso, found the following:
Downstream part number: 234-2000
Upstream part number: 234-4211
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Thanks for the replies - sorry for not getting back to the questions - that car issue is still not resolved and so the owener decided to do away with it. It was a 94 LS400 that was stalling at times, not starting sometimes and kept losing and regaining power....and no one was able to figure it out...so its gone. Thx ya'll
#9
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Thanks for the replies - sorry for not getting back to the questions - that car issue is still not resolved and so the owener decided to do away with it. It was a 94 LS400 that was stalling at times, not starting sometimes and kept losing and regaining power....and no one was able to figure it out...so its gone. Thx ya'll
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