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91 Es250 Diagnostic Codes 25 & 26


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I had the engine rebuilt about 6000 miles ago and mileage was steadily improving to an average of 23-24 mpg. Total miles to date 142000. Then it just dropped off to 18-19 mpg and the check engine light came on. Checked the codes and came up with 25 & 26. I have a original service manual and I followed the flowcharts as best able and seem to keep coming up with the Main Oxygen Sensor as the culprit. Just thought I would see if this is a common cause for these codes. My intention is to replace the sensor with a Bosch sensor which has the proper harness connector.

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