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MIL Cheater Elbow: Is It Needed With a De-Cat Exhaust? (Explained)

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Last Updated on: 7th September 2023, 12:41 am

If you install a de-cat or a high-flow sports catalytic converter on your vehicle, you may get a check engine light (also known as a MIL; malfunction indication lamp).

This is normally because the sensor is sensing the increased exhaust gas flow and interpreting it as a malfunction, thus lighting up the check engine light.

This lambda sensor extension known as a MIL cheater elbow may address the problem quickly, but getting the car remapped is recommended to guarantee that the problem is resolved.

MIL cheater elbow for de cat exhaust

Usually, it is recommended to get the car remapped if you install the decat, as its likely to trigger the check engine light.

From anecdotal reports it works some of the time and some of the time it doesn’t. It’s generally used with a sports cat that can sometimes trigger the MIL.

  • Andy Lewin

    Andy Lewin is a senior mechanic, ASE qualified master technician, and an experienced automotive engineer. He's passionate about serving the automotive community with the highest-quality and trustworthy information on all things automotive. He loves to write about car repairs, maintenance, car modifications and tuning, faults, and much more.

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