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EuroVan (2.5L)

  1. Ensure engine idle speed is okay. Ensure there are no exhaust system leaks between catalytic converter and cylinder head. Connect Scan Tester (VAG 1551) to Data Link Connectors (DLC) located in fold-down storage shelf in front of relay panel. Refer to the appropriate TESTS W/CODES article in this section.
  2. With scan tester in READ MEASUREMENT BLOCK function, ensure coolant temperature is more than 185°F (85°C) as displayed in channel No. 1 of scan tester. Allow engine to run for 2 minutes at idle.
  3. Connect CO tester using Adapter (VAG 1363/3) on CO tap tube. DO NOT remove oxygen (O2) sensor. Measure CO level (0.3-1.2%), then read oxygen (O2) sensor factor (signal) in channel No. 3 of scan tester. Display value must fluctuate between 0.0-0.75 volts.
  4. If value in channel No. 3 does not fluctuate, disconnect vacuum hose from fuel pressure regulator. Value must increase then drop back to original value. If value does not change, check voltage supply to oxygen (O2) sensor heater, repair oxygen (O2) sensor circuit or replace oxygen (O2) sensor as necessary. After repairs, erase DTC memory (if applicable) and select END DATA TRANSFER function.
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