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Hyundai
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2004
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Elantra GLS, Standard
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Repair and Diagnosis
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Engine Performance
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System
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Fuel System
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DTC Trouble Shooting Procedures
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DTC P1166: O2 Sensor System Lambda Bank Controller At The Limit (Bank 1)
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Inspection Procedures
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7. Check Front HO2S
7. Check Front HO2S
Temporarily install a good HO2S and check for proper operation.
Is problem corrected?
No: Go to next step.
Yes: Replace it.