pwk Posted October 23, 2007 Share Posted October 23, 2007 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. Quote Link to comment Share on other sites More sharing options...
pwk Posted November 3, 2007 Author Share Posted November 3, 2007 Replaced the O2 sensor in the exhaust pipe and the check engine light went off. Now to see if the mileage improves. Quote Link to comment Share on other sites More sharing options...
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