45 minutes top
13.5 hours labor is standard time.
alldata puts it at 5.0 hours
The book time from most shops will be anywhere from 10-13 hours, I just had mine done, on my 95 windstar 3.8
"http://wiki.answers.com/Q/What_is_the_shop_labor_hours_to_replace_a_knock_sensor_on_a_infiniti_q45_1997"
The sensor is located under the intake manifold. It takes about 2 and half hours to replace the intake manifold, book time. Knock sensor is about $35 + $60-$90/hr labor. So you are talking about $300.
labor cost to change an oxygen sensor in a 1995 toyota avalon
labor hours to replace evaporators dodge grand caravan se 2009
$300 with labor
if its the 3.1, 3.3, or 3.8 engine labor hours average 4.5 hours
labor time is 2.5 hours
3.5 HOURS
Should be about 3 hours labor.