2018 AUDI A4 Complaints

Visible wiring has become exposed in the windshield/A-pillar area. There is no airbag/SRS warning light at this time, and I am not able to determine from visual inspection whether the exposed wiring is related to the restraint system. However, this is a safety-sensitive area because it can contain or route electrical wiring near trim, sensors, and safety-system areas. Exposed or unsecured wiring in this area may create a risk of electrical short, damaged wiring, impaired signal integrity, loose trim, moisture intrusion, or safety-system malfunction. The concern was reported as part of broader electrical and safety-related issues. No crash, fire, injury, or fatality occurred. This complaint is being submitted because exposed wiring in the A-pillar/windshield-pillar area is not normal and should be inspected to determine whether the wiring, trim, connector routing, or related electrical/safety components are compromised. The vehicle/component is available for inspection, and photo evidence and service communications are available.

The vehicle displayed a low coolant warning and the coolant reservoir was low. Audi dealer service records dated on or about 02/14/2025 document the concern as: “client states low coolant warning was on, coolant reservoir is low, diagnose and advise.” The dealer performed coolant-related work involving the thermostat gasket / coolant hoses or connections to the coolant reservoir, ran the vehicle to operating temperature, and rechecked. The concern is being reported because the coolant loss/refill issue continued or remained unresolved afterward. The exact source of coolant loss is unknown, but it may involve the water pump, thermostat, coolant reservoir, coolant hoses/pipes, pressure loss, internal coolant leak, or coolant loss that evaporates before leaving visible residue. This is a safety concern because coolant loss can lead to overheating, warning messages, limp mode, loss of propulsion, engine damage, steam/smoke, or stall risk while driving. No crash, fire, injury, or fatality occurred. The vehicle/component is available for inspection, and Audi service records, coolant-system communications, photos, and water-pump/coolant-related documents are available.

The rear-view camera intermittently fails to engage when the vehicle is shifted into reverse. When the camera does display, the image sometimes shows horizontal glitch lines/artifacts. This affects backing visibility and parking safety and creates a risk of collision with pedestrians, objects, vehicles, or property. The concern was reported to Audi service along with other electrical/driver-assistance symptoms, suggesting a possible camera, wiring, module, signal-processing, or broader electrical fault. No crash, fire, injury, or fatality occurred. This complaint is being submitted because the rear camera/reverse display is a backing-safety system and the intermittent failure is unpredictable. The vehicle/component is available for inspection, and photo/video evidence and service communications are available.

An Audi dealer installed 245/40R18 93H tires on this 2018 Audi A4, while the vehicle placard/specification requires 245/40R18 97H. The lower load index reduces capacity from 1,609 lb per tire to 1,433 lb per tire, approximately 704 lb total across four tires. This creates a safety risk because load-rated tires affect vehicle stability, heat buildup, braking, steering/cornering, suspension loading, and tire failure/blowout risk. After discovering the mismatch, the concern was reported to the dealer and Audi, but the dealer stated the 93H tires were acceptable rather than providing a safety-based correction. No crash, fire, injury, or fatality occurred. This complaint is being submitted because the vehicle may have been operated with under-rated tires and because the issue can affect handling, braking, tire durability, suspension/wheel components, and safe vehicle control. Tire/repair-order records, door-jamb placard evidence, load-index comparison evidence, and dealer communications are available.

I am reporting recurring safety-related defects on my 2018 Audi A4 involving Automatic Emergency Braking, Forward Collision Warning, Audi pre sense/front-collision functionality, and related electrical/driver-assistance reliability. The AEB/forward-collision system has shown two unsafe intermittent behaviors. At times it has failed to activate as expected when crash-mitigation assistance appeared reasonably available. At other times it has unexpectedly warned, jolted, or applied braking when there was no apparent vehicle, object, pedestrian, or hazard close to the car. Unexpected braking or false intervention can startle the driver, create rear-end collision risk, and reduce confidence in the system. Failure to activate can also increase forward-collision risk. The system was not intentionally disabled by me, and I am not aware of any driver-caused obstruction, modification, or normal explanation. The condition is intermittent and may not appear during a brief service visit or basic fault-code scan. This concern was reported through Audi/dealer service channels, including a documented repair request identifying the AEB system as malfunctioning and failing to activate as designed. A later dealer communication stated that there were no stored AEB faults and later clarified that no work was done on the AEB system, no inspection or verification of AEB operation was performed, and confirmation of operation would require an additional estimate. I am reporting unresolved safety status because intermittent active-safety failures or false interventions may not store permanent DTCs, and lack of stored faults is not complete safety verification. I have not received final written safety closure confirming inspection, calibration review, road-test verification, factory scan/freeze-frame review, module communication review, and technical verification. No crash, fire, injury, or fatality is being reported. The vehicle is available for inspection if requested.

The contact owned a 2018 Audi A4. The contact stated that while driving at an undisclosed speed, there was fluid leaking from the front of the vehicle. No warning lights were illuminated. The contact also stated that while the vehicle was parked, there was a puddle of fluid leaking from the front of the vehicle. The vehicle was taken to an independent mechanic, where it was diagnosed and it was determined that the water pump had failed and needed to be replaced. The vehicle was not repaired. The dealer was contacted. The vehicle was not diagnosed or repaired. The manufacturer was not made aware of the failure. The failure mileage was approximately 92,000.

This problem is extremely sporadic, and often remedies itself after car shut down, and sometimes require that the car sit for a period of time. I estimate the following issue happens ~1 time a month, or estimated 5% of the time. Weather (temperature specifically) does not appear to impact occurance. When reversing, at times the back up camera does not function properly. During these times, the parking sensors appear to work, but it's unclear if the emergency reverse automatic braking system is working. The backup camera issues present themselves in several different ways and are described below. 1) Scrolling view (think of an old time movie, where the image "scrolling" through the screen 2) Black, but not completely black, includes what appears to be interference (sometimes white pixels flash randomly throughout the screen) 3) Off color (almost like a color inversion), darks appear light, light colors appear dark, similar to how things when developing film in a dark room 4) Similar to #1 but instead it freezes, halfway through a scroll. Often times the picture is split, with the bottom on the top, and the top on the bottom, and a clear black line in the middle Opening and closing the trunk, tapping the camera, turning the parking sensor (and camera) off and on do not solve the issue when it happens. Neither does changing from R to P on the transmission lever. Issue always requires a restart, rarely does an immediate restart fix the issue. The tracking lines are also distorted when this happens. When not malfunctioning, camera system works perfectly. Recently, I came across NHTSA ID: 25V900000 which almost exactly describes my issues but my car is not included. I did recently ask the Dealer to look into it during my 40,000 mile service. They stated that no codes were in the system and they could further troubleshoot but the intermittent nature would likely result in no findings unless the issue is present on site.

My screen turns on and off consistently not allowing me to use my backup camera. Causing a small collision while backing up when the camera turned off unexpectedly. Additionally when it’s off it will auto break when I’m not close enough to hitting and it’s loud and yanked me. This has been an issue for some time and I’m seeing a significant amount of my models have this issue and it’s not safe.

Drive system malfunction message appeared after starting ignition at 6am before heading to work. Turned car off immediately and took another vehicle to work.

My car's MMI keeps restarting while driving which affects the rear view camera and while backing up it can restart and go completely blank. I feel this puts my safety at risk while backing up. It also shuts down my bluetooth to my phone which can be a hazard while driving. I have called the dealership but they will not do anything without a large diagnosis fee which i cannot afford. They have said there are no recalls against it. No warnings prior to the failure and the failure happens every time I drive it, including multiple times per use.