Vanagon Syncro AWD L4-2109cc 2.1L (1987)
Oxygen Sensor: Testing and Inspection
Checking Oxygen Sensor And Oxygen Regulation
Engine code MV
Note: There must be no leaks in the exhaust system between the cylinder heads and the catalytic converter.
Requirement
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Engine oil temperature min. 80°C (176°F)
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Connect CO test equipment hose to the sampling point on left exhaust pipe using Sun 120.239 adapter (arrow)
Test step I
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Let engine run approximately 2 minutes at idle and read CO-content
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Oxygen sensor connected
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Remove hose (1) from pressure regulator (2) and plug hose
CO should increase briefly. then drop in value to 0.3 - 1.1%
If NO:
Proceed to determine whether the problem is with the oxygen sensor or with the control unit
Test step II
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Shut off engine