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volkswagen Workshop Repair Guides


Jetta L4-1781cc 1.8L SOHC (ACC) Can (1995)

Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Testing and Inspection > Heated Oxygen Sensor (HO2S), Checking > Page 808

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If the value is within the specified range:

Press => button.

Press buttons -0- and -6- to select "End Output" function.

Press -Q- button to confirm input.

If the value displayed is not as specified:

Leave engine running at idle and check Intake Air system for leaks (unmetered air)   See: Powertrain Management/Fuel Delivery and Air
Induction/Testing and Inspection

Check Spark Plugs, Spark Plug connectors and ignition cables.

Check Evaporative Emission (EVAP) Canister Purge Regulator Valve (N80) for leaks.
^  Valve must remain closed for approx. 5 seconds after switching ignition off.

Check Heated Oxygen Sensor (H025) probe for plugging and replace if necessary.

Sensors and Switches > Sensors and Switches - Powertrain Management > Sensors and Switches - Computers and Control Systems > Oxygen Sensor > Component Information > Testing and Inspection > Heated Oxygen Sensor (HO2S), Checking > Page 808

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