Must spark plugs be replaced at a 4S shop?
2 Answers
Spark plugs do not necessarily need to be replaced at a 4S shop. Here is the method for replacing spark plugs: 1. After the engine has completely cooled, unplug the high-voltage coil connector, then use a 10mm socket to remove the fixing bolts. Once the high-voltage coil is removed, you can see the spark plug in the cylinder. 2. Depending on the size of the spark plug nut, use a 14mm or 16mm socket with a long extension to turn counterclockwise and loosen it. After loosening, use a magnetic rod to pull out the spark plug. 3. After removing the spark plug, if you cannot install the new spark plug immediately, reinsert the high-voltage coil or use a clean cloth to cover the spark plug hole to prevent dirt from falling in. 4. Use the magnetic rod to hold the new spark plug and insert it into the hole, then tighten it. Note that the torque for installing the spark plug should not be too high, approximately 20 Nm. 5. After replacing all the spark plugs, start the engine to check if the spark plugs are working properly.
I don't think spark plugs necessarily have to be replaced at 4S shops. You can do it yourself with just some basic tools and patience. My car has been running for several years, and I've changed the spark plugs twice, doing it myself each time. It saves money and is convenient. All you need is a wrench set and a spark plug socket. There are plenty of online tutorials—just follow the steps one by one. Remember to turn off the engine and let it cool down first to avoid injury. When buying spark plugs, choose the right model that matches your car. Don’t go for the cheapest ones, as poor-quality spark plugs can cause issues like engine misfires. Although 4S shops are more professional, their labor costs are too high—hundreds of yuan per visit—while doing it yourself costs just a few dozen. The job isn’t too complicated, especially for older car models. However, newer cars with electronic systems and sensors might be more complex, requiring expert help. I regularly maintain my car and replace the spark plugs every 40,000 to 50,000 kilometers to extend the engine’s lifespan. If you’re handy, I recommend giving it a try. But beginners might want to start by seeking help from a repair shop.
