Quote:
Originally Posted by B-R-Z
Just tested the heater leads on the upstream sensor and I got no reading/resistance at all and I got around 6.5 on the downstream. I ordered a replacement Denso sensor.
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sounds fairly convincing that the front sensor is no good. It unusual for them to fail, the likely cause is excessive torque when removong or installing sensor in header. Run a M18 by 1.5mm pitch thread tap\chaser through your header 02 bungs to clean up threads the sensor should screw in by hand then torque to correct torque. Put a very small amout of high temp antiseize on header threads, ensure you get no grease or antiseize on sensor tips.