Re: 09 focus,low idle
Could try cleaning the MAF . There is a TSB but it refers to 2010 models .
DTC P2111 OR P2112, OR LOWER THAN DESIRED ENGINE IDLE SPEED, ENGINE IDLE SPEED FLUCTUATES WITH OR WITHOUT DTC'S.
2.0L may exhibit diagnostic trouble codes P2111, P2112, or the idle speed drops lower than desired and or fluctuates. The idle speed concern can be intermisttent and DTC's P2111, P2112 may or may not be present.
Applies to 2.0L engine with build dates from 2/11/2010 to 8/2/2010
If vehicle exhibits any of the following symptoms, replace the throttle body
DTC P2111 and or P2112
Idle speed lower than desired
Idle speed fluctuates