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Company news about What are the symptoms of a bad exhaust gas temperature sensor?

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What are the symptoms of a bad exhaust gas temperature sensor?

2026-05-15

A malfunction in the exhaust temperature sensor typically manifests as reduced power output, increased fuel consumption, excessive exhaust emissions, and the illumination of a warning light on the dashboard.

**Significant Decline in Power Performance**
Engine output power diminishes, resulting in sluggish response during rapid acceleration and a lack of vigor when climbing hills or overtaking other vehicles. Cold starts become difficult; particularly in low-temperature environments, multiple ignition attempts may be required to successfully start the engine. In severe cases, the vehicle may experience unstable idling or intermittent interruptions in power while driving.

**Abnormal Surge in Fuel Consumption**
Because the ECU is unable to precisely regulate the air-fuel ratio, fuel consumption in urban driving conditions typically increases by 10% to 15%. The exhaust pipe may emit the odor of unburned gasoline, and the frequency of refueling will noticeably increase.

**Exhaust System Anomalies**
Harmful substances in the exhaust gas exceed regulatory limits, making it likely that the vehicle will fail its annual inspection. The OBD system frequently stores diagnostic trouble codes—such as P0420—and certain vehicle models may trigger a speed-limiting protection mode, restricting the maximum vehicle speed to safeguard the engine.

**Persistent Dashboard Warning Light**
The engine malfunction indicator light remains continuously illuminated, and some vehicle models may display specific alerts such as "Reduced Power" or "Emissions System Fault." In severe instances, the vehicle may enter a "limp-home mode," allowing it to be driven only at low speeds; prompt inspection and repair are required to prevent further damage.

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Company news about-What are the symptoms of a bad exhaust gas temperature sensor?

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News

Cases

What are the symptoms of a bad exhaust gas temperature sensor?

2026-05-15

A malfunction in the exhaust temperature sensor typically manifests as reduced power output, increased fuel consumption, excessive exhaust emissions, and the illumination of a warning light on the dashboard.

**Significant Decline in Power Performance**
Engine output power diminishes, resulting in sluggish response during rapid acceleration and a lack of vigor when climbing hills or overtaking other vehicles. Cold starts become difficult; particularly in low-temperature environments, multiple ignition attempts may be required to successfully start the engine. In severe cases, the vehicle may experience unstable idling or intermittent interruptions in power while driving.

**Abnormal Surge in Fuel Consumption**
Because the ECU is unable to precisely regulate the air-fuel ratio, fuel consumption in urban driving conditions typically increases by 10% to 15%. The exhaust pipe may emit the odor of unburned gasoline, and the frequency of refueling will noticeably increase.

**Exhaust System Anomalies**
Harmful substances in the exhaust gas exceed regulatory limits, making it likely that the vehicle will fail its annual inspection. The OBD system frequently stores diagnostic trouble codes—such as P0420—and certain vehicle models may trigger a speed-limiting protection mode, restricting the maximum vehicle speed to safeguard the engine.

**Persistent Dashboard Warning Light**
The engine malfunction indicator light remains continuously illuminated, and some vehicle models may display specific alerts such as "Reduced Power" or "Emissions System Fault." In severe instances, the vehicle may enter a "limp-home mode," allowing it to be driven only at low speeds; prompt inspection and repair are required to prevent further damage.

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