Can a faulty lambda sensor affect other sensors?
Yes, a faulty lambda sensor (also known as an oxygen sensor) can potentially affect other sensors and the overall performance of the engine. Here’s how:
- Engine Control Unit (ECU) Impact: The lambda sensor provides critical data to the ECU about the air-fuel mixture. If the sensor is faulty, it can send incorrect signals, causing the ECU to adjust the fuel mixture improperly. This can affect the readings and performance of other sensors, such as the mass airflow sensor (MAF) and manifold absolute pressure sensor (MAP), which also contribute to fuel mixture calculations.
- Fuel Injection System: A faulty lambda sensor can lead to improper fuel injection, either too rich or too lean. This can cause the engine to run inefficiently, potentially leading to increased emissions, engine knocking, or damage to other components such as the catalytic converter.
- Catalytic Converter Damage: A malfunctioning lambda sensor can cause the engine to run rich, leading to unburnt fuel reaching the catalytic converter. This can overheat and damage the catalytic converter, which may, in turn, affect the readings of downstream sensors like the downstream oxygen sensor.
- Engine Performance Issues: A faulty lambda sensor can result in poor engine performance, reduced fuel efficiency, and increased emissions. These issues can indirectly stress other sensors and engine components, potentially leading to further faults and failures.
- Diagnostic Trouble Codes (DTCs): A faulty lambda sensor can trigger DTCs that may indicate problems with other sensors. This can complicate diagnostics and make it harder to pinpoint the actual issue without a thorough inspection.
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