2001 model year · 0+ owner reports · Updated April 2026
According to Au7o's analysis of 0+ owner reports, the 2001 Audi A4 has 2 documented known issues, with 1 rated critical. The most serious is ABS Control Module Failure Triggering ABS/Brake Warning Lights and Loss of ABS Function ($200-$1,200 repair). Across all issues, repair costs range from $200 to $1,200. DIY maintenance guides at au7o.io.
On the 2000-2005 Audi A4, early 2000s A4 models are known for Bosch ABS module failures that illuminate the ABS and brake warning lights and may disable anti-lock braking and traction functions. Owners often report intermittent warning lights at first, followed by permanent faults, speedometer irregularities on some cars, or communication errors when scanned. The problem is extensively documented in owner communities and repair services because the electronic module can often be rebuilt rather than replacing the full hydraulic unit.
Scan the ABS module for communication and wheel-speed related faults, then verify wiring and wheel sensors before condemning the module. If the module has internal solder or circuit failure, the common fix is removing it for rebuild or replacing it with a properly coded unit. After repair, clear faults and confirm ABS operation with a road test on a safe surface.
Parts and tips from 0+ owners who fixed this issue
On the 2000-2005 Audi A4, b5 and early B6 A4 models commonly suffer from failing instrument cluster displays, especially the center LCD where outside temperature, warning messages, and trip computer information become unreadable due to missing pixels. Some owners also report intermittent gauge behavior or fading displays that worsen with heat. This is a well-known age-related electronics issue documented across forums and complaint records because it affects visibility of warning information and often requires cluster repair or replacement.
Confirm whether the problem is limited to the LCD ribbon/display or whether the cluster has broader internal faults. Specialist rebuilders can often repair the pixel display and restore the cluster without replacing the entire unit, while replacement clusters require immobilizer matching/coding on applicable years. Battery voltage and charging system health should also be checked because low voltage can aggravate display behavior.
Parts and tips from 0+ owners who fixed this issue
AIR BAGS:FRONTAL:PASSENGER SIDE:INFLATOR MODULE
Volkswagen Group of America, Inc. (Volkswagen) is recalling certain model year 2004-2008 Audi A4, and 2005-2011 Audi A6 vehicles originally sold, or ever registered, in Alabama, California, Florida, Georgia, Hawaii, Louisiana, Mississippi, South Carolina, Texas, Puerto Rico, American Samoa, Guam, the Northern Mariana Islands (Saipan), and the U.S. Virgin Islands, or "Zone A." Additionally, unless included in "Zone A" above, Volkswagen is recalling certain model year 2004-2008 Audi A4, and 2005-2008 Audi A6 vehicles originally sold, or ever registered, in Arizona, Arkansas, Delaware, District of Columbia, Illinois, Indiana, Kansas, Kentucky, Maryland, Missouri, Nebraska, Nevada, New Jersey, New Mexico, North Carolina, Ohio, Oklahoma, Pennsylvania, Tennessee, Virginia, and West Virginia, or "Zone B." Lastly, unless included in "Zone A" or "Zone B" above, Volkswagen is recalling model year 2004 Audi A4 vehicles originally sold, or registered, in Alaska, Colorado, Connecticut, Idaho, Iowa, Maine, Massachusetts, Michigan, Minnesota, Montana, New Hampshire, New York, North Dakota, Oregon, Rhode Island, South Dakota, Utah, Vermont, Washington, Wisconsin, and Wyoming. These vehicles are equipped with certain air bag inflators assembled as part of the passenger frontal air bag modules, and used as original equipment or replacement equipment. In the event of a crash necessitating deployment of the front air bags, these inflators may rupture due to propellant degradation occurring after long-term exposure to absolute humidity and temperature cycling.
ENGINE AND ENGINE COOLING:ENGINE
The Gates Corporation (Gates) is recalling certain aftermarket Tru-Flow Water Pumps, part number TFW 41127, sold at certain NAPA Auto Parts and/or installed by automotive service technicians after November 1, 2013 (and manufactured August 2013 through October 2013) that have a black-colored pulley/sprocket or do not have 'US9377' stamped on the water pump housing. These service replacement parts were sold for use in model year 1999-2005 Audi A4, 2000-2006 Audi TT, 1998-2005 Volkswagen Beetle, 1999-2006 Golf, 1999-2008 and 2011-2013 Volkswagen Jetta, and 2000-2005 Volkswagen Passat. In the affected water pumps, the pulley or sprocket that turns the timing belt may develop microfractures causing the timing belt to fail.
EXTERIOR LIGHTING:HEADLIGHTS
ON CERTAIN PASSENGER VEHICLES, THERE IS A POSSIBILITY OF XENON HEADLAMP COATING DEGRADATION OVER TIME. THE LUMINOUS TRANSMITTANCE OF THE HEADLAMP MAY DECREASE OVER A PERIOD OF TIME.
AIR BAGS:FRONTAL:PASSENGER SIDE:INFLATOR MODULE
Volkswagen Group of America, Inc. (Volkswagen) is recalling certain 2005-2008 Audi A4 Sedan, A4 Avant, S4 Avant and S4 Sedan, 2007-2008 RS4 Sedan, 2004 RS4 Cabriolet, 2007-2009 A4 Cabriolet and S4 Cabriolet, 2005-2011 A6 Sedan, 2006-2011 A6 Avant, and 2007-2011 S6 Sedan vehicles. These vehicles are equipped with certain air bag inflators assembled as part of the passenger frontal air bag modules used as original equipment or replacement equipment. In the event of a crash necessitating deployment of the passenger frontal air bag, these inflators may explode due to propellant degradation occurring after long-term exposure to absolute humidity and temperature cycling.
AIR BAGS:FRONTAL:PASSENGER SIDE:INFLATOR MODULE
Volkswagen Group of America, Inc. (Volkswagen) is recalling certain 2009 Audi A4 Cabriolet, S4 Cabriolet, A6 Avant, A6 Sedan and S6 Sedan vehicles originally sold, or ever registered, in Arizona, Arkansas, Delaware, the District of Columbia, Illinois, Indiana, Kansas, Kentucky, Maryland, Missouri, Nebraska, Nevada, New Jersey, New Mexico, North Carolina, Ohio, Oklahoma, Pennsylvania, Tennessee, Virginia, and West Virginia, or "Zone B." Additionally, unless included in "Zone B" above, Volkswagen is recalling certain 2005-2008 Audi A4 Avant, A4 Sedan, A6 Sedan, S4 Avant and S4 Sedan vehicles, 2007-2008 A4 Cabriolet, RS4 Sedan, S4 Cabriolet and S6 Sedan vehicles, and 2006-2008 A6 Avant and 2008 RS4 Cabriolet vehicles originally sold, or ever registered, in Alaska, Colorado, Connecticut, Idaho, Iowa, Maine, Massachusetts, Michigan, Minnesota, Montana, New Hampshire, New York, North Dakota, Oregon, Rhode Island, South Dakota, Utah, Vermont, Washington, Wisconsin, and Wyoming. These vehicles are equipped with certain air bag inflators assembled as part of the passenger frontal air bag modules used as original equipment or replacement equipment. In the event of a crash necessitating deployment of the front air bags, these inflators may rupture due to propellant degradation occurring after long-term exposure to absolute humidity and temperature cycling.
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According to Au7o's analysis of 0+ owner reports, the 2001-2001 Audi A4 has 2 documented issues. The most frequently reported are: ABS Control Module Failure Triggering ABS/Brake Warning Lights and Loss of ABS Function, Instrument Cluster LCD Pixel Failure and Intermittent Gauge/Warning Display Problems. Of these, 1 is rated critical and should be addressed promptly.
The 2001-2001 Audi A4 has 2 known issues documented across 0+ owner reports. 1 issue is rated critical: ABS Control Module Failure Triggering ABS/Brake Warning Lights and Loss of ABS Function. Prospective buyers should inspect for these issues and factor potential repair costs into their purchase decision. Regular maintenance following the manufacturer's schedule helps prevent many common problems.
Repair costs for known Audi A4 issues range from $200 to $1,200, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, ABS Control Module Failure Triggering ABS/Brake Warning Lights and Loss of ABS Function, typically costs $200-$1,200 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.
Early 2000s A4 models are known for Bosch ABS module failures that illuminate the ABS and brake warning lights and may disable anti-lock braking and traction functions. Owners often report intermittent warning lights at first, followed by permanent faults, speedometer irregularit… Repairs typically run $200-$1,200. Severity: high.
B5 and early B6 A4 models commonly suffer from failing instrument cluster displays, especially the center LCD where outside temperature, warning messages, and trip computer information become unreadable due to missing pixels. Some owners also report intermittent gauge behavior or… Repairs typically run $250-$900. Severity: medium.
Content on this page was compiled with AI assistance using NHTSA complaints, TSBs, owner reports, and public automotive data. While we strive for accuracy, this information may contain errors. Always verify repair procedures and specifications with your vehicle's service manual or a qualified mechanic.
