Purchased vehicle used 11/16 with 11,000 miles. Heat shield began rattling intermittently and increasing in frequency. Loud noise caused me have inspected while getting oil changed and mechanic found the heat shield had worn away and dropped from the bolt. He added a large washer to hold it up, which helped. Currently, it is making more rattling noise. It would be nice to have Nissan replace this as it occurred at such low mileage. I've not investigated what it would cost to replace.