I've read some O2 sensors last "10-12 years or 100K".
We know it ain't that bad but yours are 18-19 years old.
Get a DENSO replacement for the upstream sensor.
Yes, it'll be something of an experiment but the reward is better mileage.
My experience with my 2002 included a CEL (for the heater element had gone bad) and an instantaneous 20%-25% reduction in mileage....I could see the fuel gauge drop faster.
No telling how bad your likely sluggish sensor is but any improvement you can calculate will see your new sensor paid for fast.
|