NGK.com specializes in hard to find NGK products. We are not NGK Spark Plugs USA. To contact them, click here.

Why Do Some Bosch Oxygen Sensor Threads Appear "Burnt"?

Bosch oxygen sensor

 

To ensure quality, Bosch factory tests each oxygen sensor in simulated exhaust gas - guaranteeing every sensor is ready to get to work! This exhaust testing may result in a "burnt" or used appearance. The testing process takes about 10 minutes, and involves a large chamber that exposes the sensors to real life conditions. Any sensor failing that test is discarded and deemed defective. This additional step in quality control means a "tried and true" product, one worthy of your ride!