Question about Ford Focus
You might want to search for more info online - - code 136 and 1131 are for O2 sensor problems. Code 491 is for secondary air injection flow out of range. The EGR system controls the emissions in the exhaust by injecting air into the exhaust. The computer is not "seeing" the O2 sensor(s) switch back and forth and there is a problem with the secondary air flow. The air flow problem could cause the other two codes. I think the 491 and 1131 are Ford specific codes.
Posted on Jun 25, 2012
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
Here's a link to this great service
Posted on Jan 02, 2017
Tips for a great answer:
Sep 05, 2016 | 2001 Ford Focus
Mar 07, 2015 | 2002 Ford Focus
Sep 22, 2012 | 2007 Ford Focus (3 Door) Hatchback
Aug 28, 2012 | 2003 Ford Focus
May 06, 2010 | 2002 Ford SVT Focus
Feb 12, 2010 | 2003 Ford Focus
Apr 24, 2009 | 2001 Ford Focus
212 people viewed this question
Usually answered in minutes!