Why is my Suzuki Cultus showing a check engine light due to a catalytic converter issue?

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Why is my Suzuki Cultus showing a check engine light due to a catalytic converter issue?

The Check Engine Light CEL can be triggered by several issues related to the catalytic converter in your Suzuki Cultus. If the converter is clogged, damaged, o r inefficient, the vehicle’s O2 sensors located before and after the catalytic converter will detect improper levels of exhaust gases. This will cause the engine control unit ECU to trigger the check engine light. Common catalytic converter issues that can cause the CEL to turn on include:

Clogging o r blockage, preventing the exhaust gases from flowing properly.

Catalytic converter degradation, which reduces its efficiency in converting harmful gases.

Oxygen sensor malfunctions, which affect the proper functioning of the converter.

When the check engine light comes on, it’s essential to have the vehicle scanned for diagnostic trouble codes DTCs to determine whether the catalytic converter is the source of the problem.

Gari Specialist asked on 08 Apr 2025 16:42:31 pm

1 Answer

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Gari Master - on 08 Apr 2025 16:52:05 pm

The Check Engine Light CEL can be triggered for several reasons related to the catalytic converter:

Clogged o r Blocked Catalytic Converter: When the catalytic converter becomes clogged with carbon buildup, debris, o r other contaminants, it can block the flow of exhaust gases. The O2 sensors located before and after the catalytic converter monitor exhaust flow and can detect if the converter isn’t working efficiently. When this happens, the engine control unit ECU will trigger the CEL.

Degraded Catalytic Converter: Over time, the materials inside the catalytic converter like the precious metals used in the catalyst can degrade, reducing the converter’s ability to process harmful emissions. This may cause the vehicle to fail emissions tests and trigger the CEL.

Oxygen Sensor Malfunctions: If the oxygen sensors before o r after the catalytic converter fail, they can send inaccurate data to the ECU, causing the system to believe the catalytic converter is malfunctioning. This can trigger the CEL and may indicate a need for sensor replacement o r further diagnostics.

If the CEL is on due to a catalytic converter issue, its essential to get a diagnostic scan of the vehicle. The codes from the scan will help pinpoint whether the problem is with the catalytic converter itself, the oxygen sensors, o r another component of the exhaust system.