Hi Experts
i have Maxima 04 and coil pack and sparks were never replaced by my so far.
car starts no issue.
when should i replace the coil pack and spark plugs.
so far this car have only 90K
i see coil packs are expensive and trying to avoid replacing if its not needed

 

I replaced the plugs on my '04 @105Kmiles as recommended. The plugs were clean and fine then. (Gave the Max to my niece ... ~150Kmiles now).
My '07Murano got a dead #2Coil. It's upfront --> easy to replace myself, but I had the plugs replaced (by a mechanic) since it was @115Kmiles. I replaced the three coils in the rear (~$113each). Moved one old coil to #2 & keeping the two old coils (just in case ...if one fails, the rest may soon follow). Paid 3-hr labor.

 

Replacing your spark plugs wouldn't hurt when doing a tune up and replacing air filter, fuel filter and wires etc. But unless its throwing a code on a bad coil I wouldn't bother replacing until or unless its necessary.

 

Just do new plugs, wouldn't waste time with coils.