LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Buick >> 2004 >> Regal GS >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls 3.8L (Introduction, Service & Replacement) >> Repair Instructions >> Heated Oxygen Sensor Replacement - Position 2 >> Removal Procedure
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Removal Procedure

NOTE: The oxygen sensor may be difficult to remove when the engine temperature is below 48°C (120°F). Excessive force may damage threads in the exhaust manifold or the exhaust pipe.
  1. Raise and support the vehicle. Refer toLifting and Jacking the Vehicle in General Information.
    2. Fig 1: View Of HO2S (Position 2)
    GM402074Courtesy of GENERAL MOTORS CORP.
  2. Remove the HO2S electrical connector retaining tab (1) from the HO2S electrical harness connector (2).
  3. Disconnect the HO2S electrical connector from the HO2S electrical harness connector (2).
    4. IMPORTANT: Remove oxygen sensors with the engine temperature above 48°C (120°F). Otherwise the oxygen sensors may be difficult to remove.
  4. Remove the oxygen sensor (4) from the exhaust pipe using the J 39194  .
scientia non olet · About LEMON Manuals