What Causes the Engine Yellow Light to Illuminate in the Teana?
2 Answers
There are two scenarios when the engine yellow light illuminates in the Teana. The first occurs when the vehicle's power is turned on, and the car undergoes a self-check. During this process, not only the engine yellow light but also other warning lights will illuminate simultaneously before turning off, which is normal. The second scenario is when the car is started, and the engine fault yellow light remains on. This indicates that the ECU is alerting the driver to an engine fault, which is abnormal. Reasons for the engine fault light illuminating abnormally in the Teana include: substandard exhaust emissions due to factors such as poor fuel quality, a failed catalytic converter, excessive carbon buildup in the intake manifold, clogged fuel injectors, or a faulty oxygen sensor. Among these, poor fuel quality is the most common cause. Additionally, the engine fault light may illuminate due to poor engine system performance, such as issues with the throttle pedal sensor, throttle position sensor, mass airflow sensor, or poor electrical connections. In some vehicles, transmission system faults, such as internal transmission issues or slippage, are also indicated by the engine fault light. An illuminated engine yellow light signifies an engine fault. If the car shows no other abnormalities, it may continue to be driven. However, if severe vibrations, loss of acceleration power, or similar symptoms occur, it is not advisable to continue driving. Doing so may worsen the fault, damage the engine, or trigger other issues. In such cases, it is essential to visit a 4S store or repair shop for professional diagnosis and repair.
I've encountered the engine yellow warning light issue quite a few times. Friends who drive Nissan Teana often say it's commonly caused by sensor problems, especially when the oxygen sensor ages or gets misaligned, triggering the ECU to illuminate the warning light upon detecting excessive emissions. Carbon buildup in the fuel system, faulty ignition coils, or worn spark plugs can also be culprits, particularly if the car hasn't been maintained after tens of thousands of kilometers. Emission control components like catalytic converters may trigger the warning light too if clogged or malfunctioning. My advice is not to panic immediately—have a professional repair shop use an OBD diagnostic tool to read the trouble codes for precise identification. Using higher-quality fuel and regularly replacing the air filter can help prevent the problem from worsening.
