| I'm pretty sure most if not all WBs use the cheaper Bosch sensors. "Yes! Bosch tests all oxygen sensors it manufactures by subjecting each of them to a 1,000 degree Celsius functional test and a leak test to ensure environmental and functional robustness. The 1,000 degree Celsius test darkens the outer protection tube, but ensures 100% functional sensor performance." ---http://www.boschautoparts.com/Resources/FAQS/OxygenSensors.htm 1000 celsius is about 1800+ Fahrenheit. A far cry from 900 F you said.  
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