As a car owner, you might have noticed a change in the sound of your vehicle, a decrease in fuel efficiency, or an increase in emissions. These issues can be caused by an exhaust leak, which can lead to serious problems if left unchecked. In this beginner's guide, we'll show you how to diagnose and fix an exhaust leak using common household items and some creativity.Listen for Unusual NoisesOne of the first signs of an exhaust leak is a change in the sound of your car. You may hear hissing or popping noises coming from under the hood or near...

Model: 2019 Audi A3. Fault phenomenon: The cruise control function fails. Troubleshooting:  (1) Read the trouble code with the ODIS diagnostic instrument: 01—engine control unit record—U041600—ESP untrusted signal (active/static). (2) According to the test plan, it is necessary to compare the configuration of the SVM control units for 01-engine control unit J623 and 03-ABS control unit J104. After the online SVM comparison, it is prompted that the two control units are configured correctly and do not need to be changed. (3) At this time, the ODIS diagnostic instrument has been unable to provide the test plan for maintenance and can...

Model: Mercedes-Benz E300, equipped with 274.920 engine. Driving mileage: 12,415 miles Fault phenomenon: The instrument prompts “Blind Spot Assist Has Stopped Working”. Troubleshooting: Connect the XENTRY diagnostic instrument and conduct a quick test. The integrated radar sensor in the left rear bumper of the B92/11 has set a fault code: C110100 radar sensor 1 has a functional failure, A+S. Check the car’s registration card to confirm that the car is equipped with a blind spot assist system (code 234). The blind spot assist system uses short-range radar to monitor the rear and side areas of the vehicle, and if necessary,...

Model: e-tron System: Transmission Year: 2019 Driving mileage: 9,383 miles Issue: The driver's guide in the instrument cluster displays "Coolant level too low" and the coolant indicator light illuminates in red. Troubleshooting: First check that the coolant level in the expansion kettle is below the lower limit mark. Connect the diagnostic instrument to read the fault code, there is a fault code in the temperature management system control unit J1024 (address code C5): the coolant is insufficient, and the low liquid level of the sensor is displayed. Next troubleshooting for the coolant leak revealed excess coolant inside the front motor....

Model: 2021 Mercedes-Benz GLA200 Issue: The meter displays a white text prompting "Auxiliary battery failure". Troubleshooting: The problem persists, and there is no unusual sensation while driving. Connect the diagnostic instrument to do a brief test and discover that the N73 has set a fault code for the current state: the B21DC01 electronic ignition switch's buffer battery is malfunctioning. Check the vehicle registration card; this vehicle has CODE429, is equipped with a 700.4 seven-speed dual-clutch automatic gearbox, and the parking pawl lifting solenoid valve L21 is part of the electromechanical parking pawl placed on the dual-clutch transmission's casing (as shown...

Model: XC60 System: Electrical Year: 2019 Issue: The air bag light on the instrument lights intermittently.  Troubleshooting: The owner of the car reported that airbag light of the car was on, and sometimes the braking was not easy to use. We heard that he had been to the repair shop for inspection before, yet no problem was found. The car did not light up after being promoted to a higher level, and it has not been used very much recently. We connected the diagnostic instrument and discovered that different modules such as airbag SRS, instrument DIM, wiper switch, air conditioning...

A few days ago, a 2016 BMW 316Li was sent here by our friends for maintenance. This car is equipped with an N13 engine, and has two fault codes: cylinder No.3 misfire detected and cylinder No.3 injection device off. The ignition coil, spark plugs, and injectors have all been replaced, and the engine has also been disassembled. It is said that a valve is bent and should be replaced, but the problem remains still as the cylinder No.3 misfire. They had already tested the cylinder pressure, and there’s no significant difference between the 4 cylinders, all around 1100kPa. During the...

Car: Audi Model: Q5 System: Engine Fault phenomenon: The cruise control function can be activated when idling, and the speed of the cruise control can also be increased or decreased (as shown in Figure 1), but the cruise control function cannot be activated when the vehicle is driving.   Figure 1 Diagnosis: The test drive finds that the cruise control function and the engine start-stop function is not available. Check the relevant system with a diagnostic tool, we didn't find any trouble codes. Looking at the reason preventing the engine from stopping is the "diagnostic interface", the diagnostics have no...

Car: Land Rover Model: Range Rover System: Air Conditioning Year model: 2022  Fault phenomenon: The customer complained about operating the lower display screen of the integrated control panel after starting the vehicle, and found that after the vehicle air conditioner was turned on, it automatically turned off. After the test vehicle seat heating and cooling functions were turned on, it still automatically turned off. The driver found this fault, which has nothing to do with the ambient temperature and is permanent. Check that the vehicle has no additional or modified items, and the maintenance history query has no relevant maintenance...

Car: Buick Model: GL8 System: Electrical Year: 2021  Fault phenomenon: The right-hand power sliding door cannot be closed electrically via the headliner or the right-hand B-pillar closing switch.  Troubleshooting: After receiving the customer's repair request, the following inspections were carried out according to the SBD process:  Understand and confirm the fault description. Ask the customer about the time, place, phenomenon, and frequency of the failure. The customer just bought a new car, and when he was about to install it in the modification shop, he found that he pressed the closing button of the electric sliding door on the right...

Fault phenomenon: The owner of this car reported that the central control door lock did not work properly. The specific phenomenon is that when the door is locked with the remote control, the 4 doors can be locked normally. When the door is opened with the remote control, the 4 doors cannot be unlocked. Only the left front door can be opened with the mechanical key to enter the car, and the vehicle starts normally.   Troubleshooting: After picking up the car, we first confirm the fault. It is indeed as described by the car owner that the door can...

Model: F02, equipped with N52 engine. Driving mileage: 7659 miles.  Fault phenomenon: The left front door of BMW 730Li could neither be opened inside or outside, and the other three doors were kept unlocked and could be opened on both sides.  Diagnosis: There is no relevant fault record detected by the diagnostic instrument. When the car is locked with the car key, the four door locks do not respond, only the trunk and fuel tank cover can be locked, and there are double flashing warning signs. When unlocking with the car key, the 4 door locks do not respond, the...