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Volvo
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1986
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240 L4-2.3L SOHC VIN 88 B230F
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Repair and Diagnosis
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Powertrain Management
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Computers and Control Systems
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Testing and Inspection
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Component Tests and General Diagnostics
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Oxygen Sensor Feedback System
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Malfunction Tests
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Malfunction Test 8
Malfunction Test 8
1.
If CO reading does not drop when connecting electrical connector at
oxygen sensor
, replace
frequency valve
.
2.
Perform ``System Test.''