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

Tiny
ABAYA
  • MEMBER
  • 2009 CHEVROLET CAPTIVA
  • 4 CYL
  • TURBO
  • 4WD
  • MANUAL
  • 141,000 MILES
Hi,
Want to know if there are any consequences on the engine if I by-pass the Catalytic converter?
Tuesday, February 6th, 2024 AT 9:18 PM

2 Replies

Tiny
BORIS K
  • MECHANIC
  • 799 POSTS
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
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Wednesday, February 7th, 2024 AT 8:15 AM
Tiny
ABAYA
  • MEMBER
  • 59 POSTS
Thank you very much Mr. Boris.
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Wednesday, February 7th, 2024 AT 8:38 AM

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