What are the symptoms of a faulty car sensor?

[Serena]

Symptoms of a faulty car sensor: oxygen sensor poisoning, oxygen sensor ceramic cracking, heater resistance wire burnout. The rear oxygen sensor primarily monitors the working status and effectiveness of the three-way catalytic converter. Normally, the output voltage signal of the front oxygen sensor is slightly higher than that of the rear oxygen sensor, as the exhaust gas is purified by the three-way catalytic converter, resulting in a lower output voltage signal from the rear oxygen sensor. The ECU uses these two signals to determine the working condition of the three-way catalytic converter and, based on the comparison between the front and rear oxygen sensor signals, can more precisely control the air-fuel ratio. When the oxygen sensor is damaged or provides inaccurate readings, the ECU cannot receive effective feedback signals and will enter the limp mode, reading preset values from the program and injecting fuel according to the predetermined program. Without the feedback signal from the oxygen sensor, the air-fuel ratio cannot be controlled in real-time, leading to a slight increase in fuel consumption.

[DeGenevieve]

Last time my car's sensor was broken, I noticed that the engine shook violently after starting, felt weak when accelerating, and the fuel consumption suddenly increased significantly. The malfunction indicator light also came on—the one shaped like an engine. Common issues include a faulty oxygen sensor leading to excessive exhaust emissions and increased pollution, or an abnormal temperature sensor causing engine overheating or cooling system malfunctions. I took it to the repair shop, and they used a diagnostic tool to check the code, which indicated a sensor signal interruption. They said it needed to be replaced promptly to avoid further damage to the engine and higher fuel consumption. Generally, it's recommended to pay attention to dashboard warnings while driving and not delay repairs until the problem worsens.

[StRosalie]

When sensors malfunction, the vehicle usually runs poorly. I've experienced noticeable jerking during acceleration, unstable idling, and even occasional stalling. When the check engine light came on, the diagnosis pointed to a faulty mass airflow sensor causing unstable air intake control. Sensor failures are mostly due to aging or electrical issues. For repairs, I usually start by checking fuses or loose connectors - simple fixes I can handle myself, while more complex issues require a professional shop. Delaying repairs increases maintenance costs and compromises driving safety, especially on highways.

[MacValerie]

When a sensor fails, the car's performance takes a significant hit. I feel the acceleration response becomes sluggish, and the power output feels weak. For example, a faulty throttle position sensor results in noticeably delayed throttle response; issues with the RPM sensor can cause engine speed fluctuations. This has a considerable impact on daily driving and may even trigger the check engine light, affecting the driving experience. I recommend performing regular sensor checks during maintenance and replacing damaged components to quickly restore performance.