Mike's Workshop Manuals
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Chevrolet
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1999
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Tracker 4D Utility, RWD, Standard
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Repair and Diagnosis
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Engine Performance
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System
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Engine Controls - Tests W/Codes
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Diagnostic Tests
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DTC P0420: Three-Way Catalyst (TWC) System Low Efficiency
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Condition For Setting DTC
Condition For Setting DTC
Waveform output of HO2S (sensor 2) is similar to waveform output of HO2S (sensor 1) for 96 seconds.