{HEAD ~ The sensor} is located in an engine component opening, such as a spark plug well, and is engaged with first and second walls that define the ends of {TAIL ~ the opening} 
{ HEAD ~ The sensor } is located in an engine component opening , such as a spark plug well , and is engaged with first and second walls that define the ends of { TAIL ~ the opening }
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL