help finding the right O2 sensor

[BUTCH1]

you'll throw codes and should replace them as need be over time. 200 for 4 sensors is still cheap though

I've been seeing a MPG drop over the last 5K miles of like 2MPG, maybe it's time for plugs, 7 yrs 76K miles. Hookup to Torque didn't reveal any unusual trims or codes..

 

[Zivic]

I've been seeing a MPG drop over the last 5K miles of like 2MPG, maybe it's time for plugs, 7 yrs 76K miles. Hookup to Torque didn't reveal any unusual trims or codes..

maybe time for some general maintenance, check air cleaner, throttle body, plugs, and some drivetrain fluid changes.

In my experience, I have never heard of a "tired" o2 sensor causing a drop in mileage. I have seen where they begin to fail and it takes longer for the element to heat up, but this almost always throws a code. with no code, I would look elsewhere for issues

 

[phucheneh]

'Worn O2 sensors' causing a loss in mileage is a bullshit myth. If there's no CEL and you're assumably running closed loop, you don't need to replace them.

 

[LTC8K6]

I've heard of O2 sensors getting "lazy" and reacting slower without throwing a code.

 

[5150MyU]

A "LAZY" o2 sensor will cause some weird problems-won't kick a code so you have to monitor it live.

 

[BUTCH1]

maybe time for some general maintenance, check air cleaner, throttle body, plugs, and some drivetrain fluid changes.

In my experience, I have never heard of a "tired" o2 sensor causing a drop in mileage. I have seen where they begin to fail and it takes longer for the element to heat up, but this almost always throws a code. with no code, I would look elsewhere for issues

Air filter 12K on it, changed AT fluid @65K, upgraded to dextron VI, haven't checked throttle body or plugs yet..