MPG after o2 sensor

Robsyuk

Active Member
Joined
Jun 4, 2022
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LEVORG Sti
I had an error code for a faulty pre cat O2 sensor and swiftly replaced it with an oem one from Subaru.

I noticed my mpg stayed between 8kph & 4kph and granted I was only doing short journeys but it should have improved with a new sensor.

It may be placebo, but I disconnected the battery for 7hrs and on a 10mile trip after a 10minute idle, I'm seeing 11mpk!
 

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