Must spark plugs be replaced at a 4S shop?
4 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.
As a car owner, I trust 4S shops more for spark plug replacement because of guaranteed quality and safety. I don't know much about mechanics myself - I once tried changing them myself but forgot to install the gasket, which later caused engine problems that cost much more to fix. Since then, I only go to 4S shops. Though more expensive, they ensure genuine parts and professional technician adjustments to avoid damaging other components. Regular repair shops may be cheaper, but parts sources could be questionable - mismatched or low-quality spark plugs may increase fuel consumption or even cause ignition failure. 4S shops keep service records for easier after-sales issue tracing. I suggest friends who lack confidence in car maintenance prioritize 4S shops - spending more for peace of mind, especially for premium models. Develop the habit of checking spark plugs every 3-4 years, don't wait until major problems occur.
You don't necessarily have to replace spark plugs only at 4S shops; you or small repair shops can do it too, but make sure to choose the right parts. The lifespan of spark plugs is generally 40,000-60,000 kilometers. When replacing them, ensure the model matches to avoid affecting performance. For simple car models, doing it yourself is convenient and cost-effective—you only need a few wrenches, but make sure the engine is completely cool before starting. In my experience, the advantage of 4S shops lies in their original manufacturer certification and warranty. If your car is still under warranty, replacing them at a 4S shop is more reliable and avoids disputes. In daily use, paying attention to whether the engine starts smoothly can help predict potential issues.
