
Legitimate 4S stores would not engage in such practices. Below is relevant information about 4S stores: 1. Introduction: A 4S store, fully named Automobile Sales Service 4S Shop (Automobile-Sales-Servicshop-4S), is an integrated automotive sales enterprise combining vehicle sales (Sale), spare parts (Sparepart), after-sales service (Service), and information feedback (Survey). 2. Demand: The emergence of 4S stores precisely meets various customer needs. They provide well-equipped and clean maintenance areas, modern facilities and service management, a highly professional atmosphere, well-maintained service facilities, ample spare parts supply, and a prompt and efficient tracking service system. Through the services offered by 4S stores, customers can develop trust in the brand, thereby increasing sales.

I've driven several cars and visited quite a few 4S dealerships before. To be honest, most places are pretty reliable since they rely on reputation to stay in business. Tampering with your catalytic converter is really unlikely. The catalytic converter is part of the exhaust system—if it were swapped out, the owner would easily notice increased noise or failed emissions tests, and the deception would be exposed. Plus, shops nowadays have cameras and recording systems, so employees would risk getting fired if they tried anything shady—it’s just too risky. I remember once when I took my car in for an exhaust issue, the mechanic proactively showed me the old part to give me peace of mind. That said, some small shops might try to make extra money on the side since catalytic converters contain valuable precious metals, but that’s highly unlikely at major chain 4S dealerships—just pick a reputable place. Bottom line: don’t worry too much. Stay alert for unusual vehicle symptoms or take photos before repairs as proof, and you’ll be much safer.

Every time I go for maintenance, I leave my car at a familiar place. Authorized 4S dealerships with standardized procedures definitely don't have this kind of issue - their management is strict, with every operation recorded and monitored. The idea of catalytic converters being swapped sounds exaggerated; under proper systems, any employee misconduct would be detected and result in immediate termination. Besides, repair shops make enough money from legitimate services without risking their reputation. I've heard some owners encountered similar disputes, but most cases turned out to be misunderstandings due to poor communication or careless inspections. For extra precaution, just take photos of your catalytic converter before servicing, compare old/new parts afterward, or clarify what was replaced - simple yet effective. Always choose reputable large shops over cheap small garages - safety first for worry-free driving.

As a car enthusiast, I would suggest checking the location of the catalytic converter yourself before sending it for repairs. It's located in the middle of the exhaust system under the car. If it's tampered with, the engine light might come on or the power might feel strange. Normally, 4S shops wouldn't dare to mess around because the consequences are severe—they could lose their jobs or face legal action. However, if someone has ill intentions, they might tamper with it. In such cases, when picking up your car, you can request to see the old parts or compare the repair invoice. Remember to choose well-known shops with standardized systems and strict monitoring, as they rarely have such issues. Prevention is key—I always pay attention to the condition of the catalytic converter during every maintenance check.


