Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

2004 Saturn Ion 1 AutomaticFACTORY OEM SERVICE PROCEDURE

Removal Procedure

Tools Required:

J 39194-C Oxygen Sensor Wrench

Remove the exhaust manifold heat shield. Refer to Exhaust Manifold Replacement (LSJ) or Exhaust Manifold Replacement (L61) in Engine Exhaust.

Fig 1: Removing & Installing Exhaust Manifold Heat Shield

Courtesy of GENERAL MOTORS CORP.

Disconnect the oxygen sensor harness connector.
Remove the oxygen sensor using J 39194-C .

Fig 2: Oxygen Sensor & Harness Connector

Courtesy of GENERAL MOTORS CORP.

Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.