How to resolve the SVS light issue in diesel vehicles?
2 Answers
In this situation, you can try starting the engine. If it fails to start, it might indicate an issue with the fuel pump, which may need replacement. If the engine starts, the problem could lie with other sensors. The vehicle may still be drivable in such cases, but there's a possibility that the fault could affect normal operation. It is advisable to visit a repair shop for inspection as soon as possible. Below are related details: 1. Appearance of the SVS fault light: Vehicles with electronic fuel injection systems are equipped with an electronic control unit (ECU), similar to a human brain. This ECU is pre-programmed with all standard electronic parameter values during manufacturing. If the vehicle's parameters deviate from these standard values during use, the fault light (SVS) will illuminate, alerting the driver to a potential issue. 2. Scope of the SVS fault light: This fault light is a general indicator for all electronic faults, including issues with sensors such as the throttle position sensor, intake pressure sensor, oxygen sensor, coolant temperature sensor, knock sensor, crankshaft position sensor, airbag sensor, and others. 3. Meaning of the SVS light: The SVS light in a vehicle is similar to the engine fault light. When the SVS indicator lights up, it means the engine control unit has detected an erroneous signal from a sensor or that the sensor's readings are outside the standard operating range.
My diesel car also had the SVS light come on, which really worried me at the time. I remember it was a rainy day, and the light came on right after I got on the highway, accompanied by slight engine shaking. When I took it to the repair shop and checked the fault code, they said two fuel injectors were clogged. The mechanic suggested adding fuel additive and driving on the highway first, but after driving 200 kilometers, the light still didn’t go off. Later, the entire set of fuel injectors was replaced to fix the issue. The mechanic reminded me that diesel cars are especially vulnerable to poor-quality fuel—too much water or impurities can clog the fuel system. Now, I only refuel at Sinopec and regularly add fuel system cleaner. Addressing such issues early can prevent bigger troubles, like high-pressure pump damage, which could cost thousands to replace. Don’t skimp on regular maintenance, and remember to change the air filter frequently.
