Vanagon F4-1915cc 1.9L (Water Cooled) (1983)
Oxygen Sensor: Testing and Inspection
Checking Oxygen Sensor
Preliminary condition:
Engine oil temperature at least 60°C (140°F)
Work sequence
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Connect CO meter to test receptacle on exhaust pipe (left side)
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With ignition turned OFF, disconnect connection 1 between oxygen sensor and control unit
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Pull off vacuum hose 2 from pressure regulator and block hose
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Start engine
CO must increase to above 1.5%
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After about 2 minutes reconnect connection 1
CO must drop to 0.7 ±0.4%
If NO, following components may be defective:
Wire between oxygen sensor and control unit or control unit
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Check wiring by disconnecting connection 1 again and ground wire end coming from control unit
CO must increase
If OK, oxygen sensor must be defective or leak in exhaust system between catalytic converter and cylinder head