Other information:
Removal
WARNING:
The Tire Pressure Monitoring System (TPMS) sensor
battery may release hazardous chemicals if exposed to extreme mechanical
damage. If these chemicals contact the skin or eyes, flush immediately
with water for a minimum of 15 minutes and get prompt medical attention...
Inspection
NOTE:
Dropped spark plugs should always be discarded.
Unfired
An unfired spark plug should appear very clean
with a pure nickel finish to the threads and ground strap. The center
electrode ceramic insulator surface is often a matte or dull finish and
pure white in color...