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Check MAF sensor (G70). See DTC P0101/16485, DTC P0102/16486 & DTC P0103/16487 . If MAF 11. Turn ignition off. Raise vehicle and remove HO2 sensors protective cover. Disconnect upstream HO2S (G39) harness connector (Black 6-pin). See Fig. 14 . 12. 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 Upstream HO2S connector terminal No. 1 and test box socket No. 70. z Upstream HO2S connector terminal No. 2 and test box socket No. 71. z Upstream HO2S connector terminal No. 5 and test box socket No. 51. z Upstream HO2S connector terminal No. 6 and test box socket No. 52. Resistance should be a maximum of 1.5 ohms for each reading. Check wiring in upstream HO2S 6-pin 13. If any resistance measurement is not okay, or a short circuit exists, repair circuit(s) as necessary. After repairs, erase DTC memory. Verify repair. Test is complete. Perform ECM relearn procedure. See TEST DTC P1166/17574: HO2 SENSOR (G130) DOWNSTREAM TWC - RICH CONTROL LIMIT Test Requirements Ensure all fuses are okay, battery voltage is at least 11.5 volts and fuel pump relay is okay. Ensure all electrical Test Procedure 1. Check air induction, secondary air injection and exhaust system for leaks. Check air filter for blockage. If no air or exhaust leaks are found and air intake is unrestricted, go to next step. If air or exhaust leaks are 2. NOTE: If MAF sensor (G70) malfunctions, a DTC for MAF sensor should be NOTE: For rich control exceeded Downstream TWC, Upstream TWC HO2S needs
2003 Volkswagen New Beetle GLS 2001-2003 ENGINE PERFORMANCE Self-Diagnostics - 2.0L - Beetle, Golf & Jetta (Engine Codes AVH & AZG)
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