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My check engine light is on and the code P1131 come on. Also at times I loose vacuum on the AC and blower. Could this be related to the about code?

Vehicle: 1999 Ford Ranger 4 cylinder

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P1131 Lack of H02S Bank 1 Sensor 1 switching, Sensor indicated lean

Yes it can be, vacuum leaks are the main cause for a 02 sensor to not switch.

 

 

 

     Here a vacuum that was cut this went to the heater vent controls, it also set a lean code condition

 

 

 

 

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