2018 Audi A4 Fuel system Problems
- Complaints
- 6about this part
- Share
- 13%of 45 total for the year
- Median mileage
- 14,000miles
- Trend
- Not enough dataFewer than 15 complaints, too few for a reliable trend.
NHTSA recorded 6 complaints about the fuel system of the 2018 Audi A4, 13% of the 45 complaints for this model year. Where a mileage was given, the median is 14,000 miles.
Fewer than 15 complaints name this part, so treat the figures as a rough indication only.
Example complaints
Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.
“Engine malfunction prevented the vehicle to engage and a significant lag. Correction of the failure has been attempted twice and a third attempt to correct malfunction is currently in progress with no movement as of yet. Gas tank has been drained and refilled and did not correct issue. Definitely not a gasoline type issue.”
NHTSA complaint #11349755, filed 2020-08, 14,000 miles“On December 29, 2022 as I was driving my engine light came on, the fuel gauge registered empty (I had over a quarter tank of fuel at the time), and my miles till empty display in the upper left of the instrument cluster went blank. I took my Audi to my Audi dealer and their recommended repair was as follows: Fuel Tank: After removing fuel pump and level sensor we found that the secondary fuel level sensor is built into the fuel tank is faulty. Recommend replacing the tank and fuel pump with the tank. …”
NHTSA complaint #11507343, filed 2023-02“The engine oil level has been gradually dropping and has required monitoring and/or adding oil between normal service intervals. The exact source is unknown. It may involve abnormal oil consumption, an external oil leak, internal engine oil consumption, PCV/oil separator issue, turbo-related oil consumption, gasket/seal issue, or oil loss that is not leaving an obvious visible puddle. …”
NHTSA complaint #11747848, filed 2026-07“The short-term MPG / fuel-consumption display gives illogical and inconsistent readings. The display can show a significant drop in short-term fuel economy after the vehicle has been parked, locked, and not running, as if the system is incorrectly factoring parked/off time into the MPG calculation. This suggests a possible fault in the onboard computer, instrument cluster, fuel-consumption calculation, sensor input, software, ECU/module logic, or related electrical system. …”
NHTSA complaint #11747851, filed 2026-07“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. …”
NHTSA complaint #11747808, filed 2026-07Related service bulletins
- 11035829Jul 13, 2026This bulletin provides information when DTC B105A1A, B103E25 is stored in 0017; fuel tank level implausible.
- 11035828Jul 2, 2026This bulletin provides information when DTC B105A1A, B103E25 is stored in 0017; fuel tank level implausible.
- 11020367Jun 26, 2025This bulletin provides information when there is corrosion on the exhaust tail pipes.
Fuel system: other model years
| Year | Complaints | Share of year |
|---|---|---|
| 2019 | 2 | 20% |
| 2018 | 6 | 13% |
| 2017 | 6 | 11% |
| 2016 | 1 | 9% |
| 2015 | 1 | 5% |
| 2014 | 4 | 13% |
| 2013 | 2 | 8% |
| 2012 | 3 | 16% |
| 2011 | 2 | 18% |
| 2010 | 6 | 9% |
| 2009 | 8 | 7% |
| 2008 | 11 | 6% |
| 2007 | 11 | 6% |
| 2006 | 10 | 3% |
| 2005 | 12 | 5% |
| 2004 | 56 | 30% |
| 2003 | 51 | 24% |
| 2002 | 7 | 4% |
| 2001 | 3 | 2% |
| 2000 | 1 | 1% |
| 1999 | 4 | 2% |
| 1998 | 1 | 0% |
| 1997 | 1 | 1% |
| 1996 | 1 | 1% |
Other parts of the 2018 Audi A4
18 complaintsElectrical system
17 complaintsBody and structure
6 complaintsEngine
5 complaintsTransmission and drivetrain
5 complaintsAir bags
4 complaintsBrakes
4 complaintsForward collision avoidance
4 complaintsBack-over prevention (rear camera)
2 complaintsSuspension
2 complaintsElectronic stability control
1 complaintsEngine cooling
1 complaints
← All problems reported for the 2018 Audi A4
About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 29, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.
To check a specific vehicle for open recalls, use its VIN at nhtsa.gov/recalls. Methodology