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1995-2002 Range Rover P38A
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Discussion Starter #1
it isn't clear from the archives so i ask.

the 2 upstream o2 sensors provide data to ensure proper fuel ratio and are important in proper performance and mileage.

the downstream 02 sensors measure particulates and provide emissions data for epa compliance but have no function in setting fuel trim.

is this correct?
 

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Correct... somewhat. Upstream sensors ensure correct fuel ratio/emissions. Downstream sensor simply verify that the upstream ones are doing their job. Oversimplified, but gives you the idea. NAS rigs with O2 issues are almost going to be an upstream sensor.
 
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