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Causes and fixes for a Ford P1131 engine code, Lack of Upstream Heated Oxygen Sensor Switch Sensor Indicates Lean Bank 1
How To Test Upstream Oxygen Sensor 1 Video: • How To Test Toyota Ups...
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How To Test Oxygen Sensor Heater Element Video:
• How To Test Oxygen Sen...
Possible Causes of a Ford P1131 Code:
A/F Heater Oxygen Sensor
Wiring Open or Short
Fuse
Exhaust Leak
Engine running lean on Bank 1
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