The noise started earlier this year (I brought the car new in 2009). I can hear the clunking/ knocking noise sometimes when I am driving, but I hear it mostly when I stop. The dealer said it’s my car cooling down (exhaust), but the knocking noise is louder than just a car cooling down. Plus, I am just hearing the noise this year. Within the first year of me buying my car there was a recall for the front upper strut insulators which I had replaced at the dealership. I now have 35,220 mileage.
Hearing a clunking/knocking noise near upper front wheel on the passenger side. on 2009 Nissan Altima
by Cassio in Columbia, SC on October 25, 2011
ANSWER by patrick mannion on October 25, 2011
Sounds like a bad upper front strut mount or bad front suspension strut. Get the dealer's mechanic to go for a drive with you so you can point out the noise you are concerned about.
ANSWER by bubba13 on July 29, 2012
I also have a 2009 Altima. It is in fact the car cooling down. I hear the noise more pronounced in warmer weather. The sound comes from underneath the passenger seat. No worries.