What Causes the Accord's Engine Warning Light to Illuminate?

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There are several reasons why the Accord's engine warning light may illuminate: Reason 1: Poor fuel quality. Many car owners notice the engine warning light comes on after refueling, but find the engine operates and sounds normal upon starting the vehicle. This is typically caused by issues with the gasoline. Solution: Generally, adding a fuel additive or refueling with fresh gasoline after the current tank is used up will resolve the issue. The vehicle can continue to be driven under these circumstances without safety concerns. Reason 2: Oxygen sensor malfunction. If the engine warning light comes on while driving, this is usually due to a problem with the engine sensor, specifically abnormal data from the front oxygen sensor monitoring the air-fuel mixture ratio. Solution: Have the sensor tested and replaced at a repair shop using diagnostic equipment. Reason 3: Thermostat failure. The engine warning light may also illuminate if the thermostat malfunctions. If the temperature gauge fails to reach the ideal operating temperature (typically 90 degrees) over an extended period, the engine warning light will activate. This is often due to coolant not being replaced within the recommended mileage interval or the engine radiator failing to dissipate heat, leading to thermostat rust or damage. Solution: First, thoroughly inspect the vehicle, listening for any unusual engine noises and checking if the exhaust appears excessively black or blue. If the situation is severe, avoid continuing to drive and arrange for towing to a 4S shop for prompt repair. An illuminated engine warning light doesn't necessarily mean the engine is inoperable. However, it does indicate the need for inspection and repair. If you're near a service center, it's advisable to have the vehicle checked immediately.