Are there any consequences on the engine if I bypass the Catalytic converter?

2009 CHEVROLET CAPTIVA
141,000 MILES • 4 CYL • TURBO • 4WD • MANUAL
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ABAYA
  • MEMBER
  • 77 POSTS
Hi,
Want to know if there are any consequences on the engine if I by-pass the Catalytic converter?
Feb 6, 2024 at 9:18 PM
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BORIS K
  • ✓ASE Certified Mechanic
  • 836 POSTS
  • ASE Certified Mechanic
Hello,

A catalytic converter removal will not affect the engine mechanically, but the engine warning light will come on as the ECM will see a downstream oxygen sensor issue.

This then would require an ECM remap to stop the light from coming on.
Be aware that the vehicle will have higher emissions and might not pass an emissions test, depending on where you live.

Cheers, Boris
Feb 7, 2024 at 8:15 AM
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ABAYA
  • MEMBER
  • 77 POSTS
Thank you very much Mr. Boris.
Feb 7, 2024 at 8:38 AM
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