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Discussion Starter · #1 ·
Hello again,

I have recently removed catalytic converter and it seems that the MPG went down a bit. The car runs fine, even better then before and no CEL.

There are no regulations in my country for the emission so it is not illegal to remove the catalytic converter.

I have read on these forums, that on some wranglers downstream O2 sensor does not do anything except monitoring the catalytic. Some say that it will run rich and cause the low MPG.

The wrangler is 1997 4.0 with 3 speed auto trans. And the question is:

Does the downstream O2 Sensor affect the fuel/air mixture and cause lowering MPGs ???
 

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There should be a difference between the upstream and downstream o2 sensors. If the ECU is not getting the correct signal, it will adjust the fuel trim to compensate. You probably will get a CEL somewhere along the line.
 
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