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Test Procedure 1. Check air induction and secondary air injection system for leaks. If no air leaks are found, go to next step. If air leaks are found. Repair as necessary. After repairs, erase DTC memory. Verify repair. Test is 2. Connect scan tool, see RETRIEVING DIAGNOSTIC TROUBLE CODES . Using generic scan tool, following scan tool manufacturer's instructions, check aging of downstream HO2S. 3. This test requires using Scan Tool VAG 1551/1552 or VAS 5051/5052. For A/T put vehicle gear selector 4. Test drive vehicle (to burn HO2S clean) and retest system. If test is okay after test drive, erase DTC memory. Test is complete. Perform ECM relearn procedure. See TEST DRIVE RELEARN 5. Turn ignition off. For Passat, see Fig. 18 . For all other models. Raise vehicle and remove HO2 sensors protective cover and disconnect downstream HO2S (G130) harness connector (brown 4-pin), see Fig. 19 . 6. Turn ignition off. Connect DVOM between terminals No. 3 and 4 of downstream HO2S harness connector, see Fig. 23 . Start engine, check ECM supplied basic voltage. Turn ignition off. Voltage 7. Turn ignition off. Disconnect ECM harness connector, leave ECM disconnected from test box. Connect Test Box (VAG 1598/31) to ECM harness connector. See CONNECTING VAG TEST BOX . Using z Downstream HO2S connector terminal No. 3 and test box socket No. 68. z Downstream HO2S connector terminal No. 4 and test box socket No. 69. Resistance should be a maximum of 1.5 ohms for each reading. Check wiring in downstream HO2S 4-pin NOTE: Catalytic converter must be 662° F (350° C) to 932° F (500° C) for scan tool
2003 Volkswagen New Beetle GLS 2002-2003 ENGINE PERFORMANCE Self-Diagnostics - 1.8L Turbo
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