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Home >> Hyundai >> 2004 >> Elantra GLS, Standard >> Repair and Diagnosis >> Engine Mechanical >> Fuel System >> DTC Trouble Shooting Procedures >> DTC P1166: O2 Sensor System Lambda Bank Controller At The Limit (Bank 1) >> Inspection Procedures >> 6. Check Spark Plugs For Normal Operation

6. Check Spark Plugs For Normal Operation

  1. Remove the spark plugs and inspect the spark plug tips.
  2. Check for abnormal color of the spark plug tips compared to other cylinders.

Is there any spark plug with abnormal color compared to other cylinders? 

No: Go to next step.

Yes: Check engine for mechanical failure. If it is okay, replace spark plugs.

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