I need help on o2 sensor
#16
Lexus Test Driver
If it's a pre-cat O2 sensor that's gone bad, I suppose that could cause fuel efficiency or power loss. If it's a post-cat O2 sensor...all those are there for is to verify that the cat is working....so I don't think you'll notice any difference in fuel economy or power.
I had a post-cat O2 sensor go bad on my car when it was stock and I noticed no power loss (or power gain after fixing it).
I had a post-cat O2 sensor go bad on my car when it was stock and I noticed no power loss (or power gain after fixing it).
#17
Lead Lap
iTrader: (1)
I think maybe all 4 brand new is what properly improves fuel consumption. Maybe not by much, but definitely an improvement slightly. I agree about post cat o2s not doing much. But 2 old and 2 new o2s won't work well together, IMO. If someone is gonna change an o2, they might as well change all of them. Piece of mind at the end of the day you know.
It's not like an O2 sensor is a terribly complex device. It sends voltage between 0v and 1v to the ECU based on oxygen content in the exhaust stream. It's either working or not working. Replacing all four O2 sensors because one goes bad is like replacing all four tires because you got a flat.
#18
Lexus Test Driver
If our cars only had two O2 sensors I might be inclined to agree with you. However, we don't. We have four. Replacing all four when only one is known to be bad is quite an expensive endeavor just for peace of mind.
It's not like an O2 sensor is a terribly complex device. It sends voltage between 0v and 1v to the ECU based on oxygen content in the exhaust stream. It's either working or not working. Replacing all four O2 sensors because one goes bad is like replacing all four tires because you got a flat.
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