What Causes the Fault Light to Illuminate in the Baojun 730?
2 Answers
The reasons for the engine fault light illuminating in the Baojun 730 include a damaged oxygen sensor, a faulty three-way catalytic converter, or the need to tighten or replace the fuel tank cap. Oxygen Sensor Replacement Needed: The oxygen sensor is crucial for both engine performance and environmental protection. It measures the amount of unburned oxygen in the exhaust to determine if the vehicle's fuel-air mixture is at its optimal state. There are many reasons for oxygen sensor failure, such as not changing the engine oil regularly or failing to clean impurities from the coolant in the engine promptly. If the oxygen sensor fails, fuel consumption may increase by more than 40% compared to normal levels. Three-Way Catalytic Converter Replacement Needed: The three-way catalytic converter usually doesn't encounter issues, but if problems with the spark plugs, ignition coils, or engine mechanical faults are not properly addressed, they can damage the three-way catalytic converter. Tightening or Replacing the Fuel Tank Cap Needed: According to statistics, issues with the fuel tank cap account for 7.1% of vehicle fault investigations in a year, which is not a small probability. If the fuel tank cap is lost or damaged, it can waste both time and money, and of course, the engine fault light will also illuminate. Problems with the fuel tank cap may lead to increased fuel consumption and environmental damage.
A while ago, the yellow engine light on the dashboard of my 730 suddenly came on, which really gave me a scare. I drove it to a familiar repair shop for inspection, and the mechanic plugged in a diagnostic tool to read the fault code, which indicated an issue with the oxygen sensor. The mechanic explained that for family MPVs like the Baojun, the sensor near the exhaust pipe is prone to rust due to moisture over time, or inaccurate data from using low-quality fuel. Other issues like an air leak in the intake system, aging spark plugs causing misfires, or a loose fuel cap leading to evaporative emissions can also trigger the warning light. The mechanic advised me not to drive it hard and to check the code as soon as possible, as it could be serious if it were due to low oil or abnormal coolant temperature. Later, I replaced it with an aftermarket sensor for just over 300 yuan, and the light hasn’t come on since.
