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It came up with the code P1131 MOD 10 what does MOD 10 mean? The truck is a 1999 Mazda B3000 3.0L. What does MOD 10 mean?

Vehicle: 1999 Mazda B3000 3.0L

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P1131 MAZDA Code - Lack of Upstream Heated Oxygen Sensor Switch - Sensor Indicates Lean - Bank 1
Read more: https://www.autocodes.com/p1131_mazda.html

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