626 LX L4-2.0L DOHC (1999)
3. Select "O2S11" and "O2S12" on the NGS tester display and press START. The NGS tester measures and shows the voltage.
4. If not as specified, inspect the following.
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Intake-air system
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Fuel system
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On-board diagnostic system
5. If these systems are okay, replace the heated oxygen sensor.
