Focus on vibration
Some 2000-2011 Ford Focus vehicles may exhibit an excessive engine vibration at idle, most noticeable when the transmission is engaged in reverse. This condition may be caused by small stones, road debris, ice or snow packed/lodged in the rear engine roll restrictor.
Inspect the rear engine roll restrictor for debris and remove any debris.
Remove the cross member-to-roll restrictor attachment bolt.
Install a service shield, P/N 2M5Z-16102-AB.
Install the roll restrictor attachment bolt and torque the bolt to 35 ft.-lbs. (on 2000-2007 models); or 52 ft.-lbs. (on 2008-2011 models).