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This can be caused by a number of things, the most likely being a failure in the oxygen sensor or it's wiring, like a broken or corroded harness.

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Q: What does the code p1131 h02s-11 mean on a 1999 mercury mystique?
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What does code p1131 mean on a 1999 Mercury Mystique?

P1131 = Insufficient switching O2 Bank 1 Sensor 1 Sensor/lean. Could be a B1 S1 O2 sensor going bad.


Where is the iac valve located on a 1998 Mercury Mystique?

were is the iac locate on a 1999 mercury mystique


Is the fuel pump in the gas tank on a 1999 mercury mystique?

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According to the 1999 Mercury Mystique Owner Guide : ( 58.5 liters / 15.4 U.S. gallons )


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The thread on cap on your engine coolant reservoir is the pressure cap / radiator cap on a 1999 Mercury Mystique


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According to the 1999 Mercury Mystique Owner Guide : ( 58.5 liters / 15.4 U.S. gallons )


Which oil for 1999 Mercury mystique?

According to the 1999 Mercury Mystique Owner Guide : ( 5W-30 ) certified for gasoline engines ( 2.0 and 2.5 liter )


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The 1999 Mercury Mystique OBD 2 port is under driver side dash next to hood release


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IN the Middle!¬


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