How can a faulty oxygen sensor affect the catalytic converter in my Suzuki Cultus?

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How can a faulty oxygen sensor affect the catalytic converter in my Suzuki Cultus?

A faulty oxygen sensor can indirectly damage the catalytic converter in your Suzuki Cultus. Oxygen sensors monitor the level of oxygen in the exhaust gases and send this information to the engine control unit ECU to adjust the air-fuel mixture for optimal combustion. If the oxygen sensor malfunctions and provides incorrect readings, the engine may run rich too much fuel o r lean too little fuel. A rich mixture, in particular, can cause excessive heat buildup in the catalytic converter, leading to its premature failure. If you suspect a faulty oxygen sensor, it’s important to replace it promptly to protect the catalytic converter from damage.

Gari Specialist asked on 08 Apr 2025 16:41:11 pm

1 Answer

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Gari Master - on 08 Apr 2025 16:51:42 pm

A faulty oxygen sensor can indirectly damage your catalytic converter. Oxygen sensors monitor the level of oxygen in the exhaust gases and provide data to the engine control unit ECU to adjust the air-fuel mixture. If the oxygen sensor fails, it can send incorrect signals to the ECU, causing the engine to run with an improper air-fuel ratio.

Running Rich: If the engine runs too rich with too much fuel, the excess fuel can pass through the catalytic converter and cause it to overheat. This excessive heat can damage the catalyst material inside, leading to reduced efficiency o r failure of the catalytic converter.

Running Lean: Conversely, running too lean too little fuel can also cause engine knocking, which may eventually lead to damage to the catalytic converter.

If the oxygen sensor is faulty, it’s important to replace it promptly to avoid long-term damage to the catalytic converter and restore proper engine performance. A functioning oxygen sensor ensures the engine operates with the correct air-fuel mixture, protecting both the catalytic converter and overall engine health.