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Volvo
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1998
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V70 T-5, Automatic
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Repair and Diagnosis
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Engine Performance
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System
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Engine Controls - Tests W/Codes
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Diagnostic Tests
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DTC P0450/EFI 621, DTC P0451/EFI 621, DTC P0452/EFI 621 & DTC P0453/EFI 621
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Possible Causes (Signal Sporadic)
Possible Causes (Signal Sporadic)
Loose connections.
Contact resistance in terminals.
Defective A/C pressure sensor.
Defective acclerometer.
Defective fuel tank pressure sensor.