i have a confirmed engine code p1131 what could be the problem on my 2002 ford focus

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Carguy1 · Answer 1 · 2018-05-22T14:59:21+0000

Hi there,

The code P1131 indicates an issue with the O2 sensor switch, but there are several possible causes. Here is a list for you.

P1131 FORD - Lack of Upstream Heated Oxygen Sensor Switch Sensor Indicates Lean Bank 1

Read more: https://www.autocodes.com/p1131_ford.html

The code P0442 indicates an issue with the EVAP system. Again, there are possible causes. Here is a list for you.

P0442 FORD - Evaporative Emission System Leak Detected Small Leak

Read more: https://www.autocodes.com/p0442_ford.html