What is the method to modify a car's odometer?

[KayleeMarie]

The method to modify a car's odometer is: 1. Unplug the odometer sensor connector under the car's hood; 2. Insert the output plug of the mileage adjuster into the sensor's signal port; 3. Plug the mileage adjuster into the cigarette lighter; 4. Turn the car key to start the dashboard and adjust the settings on the mileage adjuster; 5. Adjust the speed as needed. The function of the car odometer is to record the total kilometers driven since the car left the factory. Its working principle is based on knowing the diameter of the car's wheels. By calculating the circumference of the wheel, the number of rotations needed to cover one kilometer can be determined. The odometer automatically records the number of wheel rotations and divides it by the rotations corresponding to one kilometer to obtain the total mileage.

[SanHarrison]

Honestly, tampering with the odometer is something you really shouldn't touch. In all my years working at the dealership, I've seen too many painful lessons. Selling a car with 150,000 km adjusted down to 80,000 km counts as fraud. If caught, not only do you have to issue a full refund, but you could also face legal consequences. Nowadays, the ECU in newer cars has three independent modules simultaneously recording mileage. Even if the dashboard gets reset, plugging in the shop computer will expose the truth. Last week, an acquaintance wanted to adjust the odometer, but I stopped him. Later, he honestly did a full vehicle service and kept complete records, which actually got him an extra 3,000 yuan when selling. Vehicle information isn't just recorded on the dashboard; there are backup data in the transmission control unit and airbag module too. It's impossible to cleanly alter everything.

[JesseMarie]

Recently, I've seen many people asking for odometer rollback tutorials in car repair live streams, which makes me shake my head in frustration. Just think about it, forcibly changing 200,000 kilometers to 50,000—when the buyer drives it for two days, the transmission could be ruined. It's downright harmful. Last week, Uncle Liu in our neighborhood bought a car with a rolled-back odometer and now needs a major engine overhaul. The proper approach is to keep all maintenance receipts from authorized service centers. My glove compartment is stuffed with 28 maintenance receipts from the past five years, and when I sold my car last time, it fetched 20,000 yuan more than others of the same age. The vehicle administration is cracking down hard now—last year, a dealer here was caught tampering with odometers and had their business license revoked.

[StHarmony]

Yesterday, while helping my neighbor inspect a used car, I encountered one with a rolled-back odometer. The display showed 70,000 kilometers, but upon removing the steering wheel, I found severe wear on the clock spring, which typically occurs after at least 150,000 kilometers. To avoid being scammed, you need to pay attention to details: the number of brake disc replacements is the most reliable indicator of actual mileage, and the wear on the steering wheel buttons is also quite accurate. Last time, during an inspection, I noticed regular scratches on the metal edges of the seat adjustment buttons—each adjustment leaves a mark, which helped expose the odometer fraud. When buying a used car, it's best to bring an endoscope to check the thickness of engine carbon deposits; it's far more reliable than relying on the odometer.