Smoke coming from 02 sensor/exhaust manifold

2005 PONTIAC GRAND PRIX
185,000 MILES • 3.8L • 6 CYL • 2WD
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CORTEZ LARKIN
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  • 1 POST
When i start my car i get smoke and a clicking sound coming from the 02 sensor where the exhaust manifold connects.
Feb 9, 2020 at 8:04 PM
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JACOBANDNICKOLAS
  • ASE Certified Mechanic
  • 110,194 POSTS
  • ASE Certified Mechanic
Hi,

That is an exhaust leak. If the smoke is coming from where the sensor is located, make sure it is tight. If it is tight, remove it and inspect the threads on it. Also, inspect the exhaust manifold for cracks. Note that there is a chance it is leaking where the manifold meets the cylinder head.

Check these and let me know what you find. I will further direct you once we determine the source of the leak.

Joe
Feb 9, 2020 at 8:46 PM
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