If the Denso is brand new and sealed up, very doubtful it is bad.. Possible but not likely..
I steer clear of all the AutoZone, Advance, O'Reily mastercraft specials, even though they may have a life-time warranty. eek eek To me, my time & labor is far more valuable to save a few $, do the job once and right..


Just my $0.02 wink