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B0684 Alfa Romeo Auto Trouble Code

B0684 Alfa Romeo OBD2 reports a sensor fault, replacement of the sensor is unlikely to resolve the underlying problem. The fault is most likely to be caused by the systems that the sensor is monitoring, but might even be caused by the wiring to the sensor itself.

The leak detection pump is part of the evaporative emissions system. This system tests the fuel system to make sure it is not leaking fuel vapors into the air. The system pulls a vacuum on the fuel system and holds it for a period of time.

B0684 Alfa Romeo Possible Solution:

Vehicle Speed Sensor (VSS) Out of Self Test Range Indicates the VSS input signal is out of Self Test range. If the PCM detects a VSS input signal any time during Self Test, a DTC P1501 will be set and the test will abort. Noisy VSS input signal from Radio Frequency Interference/ Electro-Magnetic Interference (RFI/EMI) external sources such as ignition wires, charging circuit or after market equipment. Check for VSS input to be 0 mph when vehicle transmission is in Park.

B0684 Alfa Romeo Description For All Models :

• Alfa Romeo 145
• Alfa Romeo 146
• Alfa Romeo 147
• Alfa Romeo 149
• Alfa Romeo 155
• Alfa Romeo 156
• Alfa Romeo 159
• Alfa Romeo 1600
• Alfa Romeo 164
• Alfa Romeo 166
• Alfa Romeo 175
• Alfa Romeo 1750
• Alfa Romeo 179
• Alfa Romeo 1900
• Alfa Romeo 20
• Alfa Romeo 2000
• Alfa Romeo 22
• Alfa Romeo 2300
• Alfa Romeo 2600
• Alfa Romeo 2900
• Alfa Romeo 33
• Alfa Romeo 4c
• Alfa Romeo 66
• Alfa Romeo 6c
• Alfa Romeo 75
• Alfa Romeo 8c
• Alfa Romeo 90
• Alfa Romeo Alfa
• Alfa Romeo Alfasud
• Alfa Romeo Alfetta
• Alfa Romeo Ar
• Alfa Romeo Arna
• Alfa Romeo Berlina
• Alfa Romeo Brera
• Alfa Romeo Concept
• Alfa Romeo Crosswagon
• Alfa Romeo Eagle
• Alfa Romeo Giulia
• Alfa Romeo Giulietta
• Alfa Romeo Gp
• Alfa Romeo Gp159
• Alfa Romeo Graduate
• Alfa Romeo Gt
• Alfa Romeo Gta
• Alfa Romeo Gtv
• Alfa Romeo Junior
• Alfa Romeo Long
• Alfa Romeo Mito
• Alfa Romeo Montreal
• Alfa Romeo Rl
• Alfa Romeo Rm
• Alfa Romeo Rz
• Alfa Romeo Spider
• Alfa Romeo Sportwagon
• Alfa Romeo Sprint
• Alfa Romeo Stelvio
• Alfa Romeo Sz

B0684 Alfa Romeo Trouble Repair : If your B0684 Alfa Romeo check engine light is illuminated, it's best to take it in for diagnostic testing, which can feel like a hassle. Because while the lights vary in appearance from vehicle to vehicle, all have the same basic meaning: There's a problem with the car's emissions system. The on-board diagnostics system and engine control unit are in charge of monitoring a bunch of different, and if they get a reading that's a little out of whack, up pops the check engine light.

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