This bulletin provides informaiton when the engine is not running smoothly, misfiring.
full bulletin at NHTSA ↗2012 Audi A6 engine problems
moderate 10 complaints filed with NHTSA · avg repair $3,100 · see engine across all vehicles →
Complaints
10
Recalls
0
Avg fix
$3,100
What stands out
Among the 10 model years of Audi A6 in our records for engine problems, this one ranks #2 by owner-complaint volume.
No new NHTSA engine complaint has been filed on this vehicle in over 13 years — the issue may be aging out of the active population.
Is there a fix? Manufacturer service bulletins
The manufacturer has issued service bulletins covering engine on this vehicle — documented repair instructions, service campaigns, or warranty extensions sent to dealers. A TSB isn't a recall (it's not a free safety remedy), but it's the manufacturer acknowledging the issue and how to fix it.
This bulletin provides information on VIN Plates, Safety Certification labels, and the ordering procedures.
full bulletin at NHTSA ↗This bulletin provides information regarding UV leak additive for finding oil leaks.
full bulletin at NHTSA ↗This bulletin provides informatin when the engine does not run smoothly at idling speeds.
full bulletin at NHTSA ↗This bulletin provides information when the MIL is on; DTCs for misfire, air/fuel ratio imbalance, or lean fuel system stored in the ECM P030000.
full bulletin at NHTSA ↗Source: NHTSA manufacturer communications. Bring the bulletin number to your dealer or shop.
The failure pattern owners describe
Owners report a range of engine and cooling system failures on the 2012 Audi A6. The most serious incidents involve complete engine failure requiring replacement (no prior warning lights), stalls on highways with no restart capability, and loss of all electrical power caused by coolant leaking into the engine control module.
Fuel system issues include injector failure and fuel leaks traced to improper recall work—one owner, an ASE Master Mechanic, discovered that a dealer never installed correct recall parts despite charging for the service. The after-run coolant pump has been problematic; it cracked during recall service and contaminated the cooling system with internal filter pellets that dealers failed to flush out, then blamed the owner for not doing maintenance.
Common mechanical issues reported across multiple owners include timing chain rattle on startup (acknowledged by dealers as typical for the 3.0T) and flex pipe cracking that produces loud exhaust noise. One owner experienced unintended acceleration episodes while stopped or at reduced speed. Recall parts for engine and cooling issues have been unavailable at dealerships, delaying or preventing repairs. One owner reported check engine light at extremely low mileage (41 miles) that persisted after dealer transmission oil service.
Failure modes owners describe
Fuel Injector Failure and Fuel Leak
Fuel injector cracked and leaked fuel into the combustion chamber and exhaust system. Owner suspects defective injector support bracket (part 06D133036H vs. recall spec 06D133036K) failed to be replaced during recall 24AP, causing improper injector geometry and stress over time. Audi dealer allegedly performed recall but did not replace the specified support bracket.
When: Noticed at vehicle startup; recall performed June 2015, failure occurred sometime after
Symptoms owners cite: Extended cranking at startup; Fuel odor from exhaust while driving; Fuel leak from injector
Repairs/costs cited: Owner (ASE Master Mechanic) disassembled fuel system and found incorrect part number (06D133036H) still installed instead of recall replacement part (06D133036K). Audi stated fuel injector failed and covered under warranty.
Recalls/TSBs owners mention: Recall 24AP for engine fuel rails and injector supports; Audi of Albany performed recall in June 2015 but apparently did not replace all specified components. Audi later covered injector failure under warranty.
After-Run Coolant Pump Failure and Contamination
Plastic after-run coolant pump cracked and broke open, releasing internal filter pellets throughout the entire cooling system. Pump was replaced twice but system was never flushed. Dealer attributed second failure to owner negligence for not flushing; independent mechanic identified bad design—filter bag broke open and contaminated coolant circuit.
When: Recall performed December 10–27, 2019; EPC light came on end of January 2020; second failure February 23, 2020
Symptoms owners cite: EPC warning light illumination; After-run coolant pump malfunction; Filter pellets circulating throughout cooling system
Repairs/costs cited: Pump replaced twice by dealer (December 2019 and February 2020). Independent mechanic found broken filter bag and pellets throughout cooling system; full coolant system flush and inspection required. Dealer acknowledged plastic pump design flaw but charged owner's extended warranty for first replacement.
Recalls/TSBs owners mention: Recall service performed December 2019; dealer replaced pump but did not flush system. Dealer later blamed owner negligence for fluid contamination instead of acknowledging design defect.
Complete Engine Failure – Loss of Function
Engine became completely non-functional and would not start after routine body shop visit. No warning indicators preceded the failure. Audi dealer diagnosed as catastrophic engine failure requiring full replacement at ~$25,000. Regular maintenance history confirmed. Cause unknown.
When: Discovered March 22, 2022 during body shop repair; car had been serviced regularly
Symptoms owners cite: Vehicle would not start; Complete loss of engine function
Repairs/costs cited: Audi dealer Jack Daniels Audi of Paramus estimated $25,000 for complete engine replacement. No diagnostic details provided.
Recalls/TSBs owners mention: Audi Corporate was asked to assist but no response received after 4 days.
Stall and No-Restart on Highway
Vehicle stalled on highway with no warning lights illuminated prior to failure. Vehicle would not restart. No diagnostic testing performed by dealer.
When: At 114,000 miles
Symptoms owners cite: Stall while driving on highway; Vehicle would not restart; No warning indicators prior to failure
Repairs/costs cited: Vehicle was towed to Audi of Huntington but was not diagnosed or repaired.
Recalls/TSBs owners mention: Manufacturer was notified. Owner referenced recall 16V619000 but that recall was for a different model vehicle.
Check Engine Light with Transmission Oil Issue
Check engine light illuminated at low mileage. Dealer diagnosed need for transmission oil replacement. Repair was performed but check engine light condition persisted.
When: At 41 miles; current mileage 44 miles
Symptoms owners cite: Check engine warning light illuminated while driving at 45 mph
Repairs/costs cited: Dealer replaced transmission oil but issue continued.
Recalls/TSBs owners mention: Manufacturer was contacted and stated they would investigate.
Timing Chain Rattle
Timing chain on back of engine, passenger side, rattles audibly. Owner reports this is a known common problem on 3.0T A6 models. Multiple mechanics and dealerships acknowledge it as typical for this engine.
When: Ongoing; common at startup
Symptoms owners cite: Timing chain rattle on passenger side; Sound similar to loose heat shield at cold startup
Repairs/costs cited: Multiple mechanics/dealerships confirmed this is a known common issue on 2012 Audi A6 3.0T.
Flex Pipe Cracking and Exhaust Noise
Flex pipe on passenger side of engine cracked, causing significant exhaust noise resembling a loose tin can. Owner reports this is also a common problem on 3.0T A6 models.
When: Timing unknown
Symptoms owners cite: Loud rattling exhaust noise from passenger side; Exhaust leak sound resembling tin can
Repairs/costs cited: Flex pipe cracked and requires replacement.
Coolant Valve Leakage into Engine Control Module
Coolant valve leaked through wiring harness, allowing coolant to enter the engine control module (ECM). This caused electrical shorting of the module, resulting in complete loss of power and mobility while vehicle was in motion on a city street.
When: During city street driving
Symptoms owners cite: Coolant leaking from valve through wiring harness into ECM; ECM short circuit; Complete loss of all electrical power and mobility
Repairs/costs cited: ECM was shorted due to coolant intrusion.
Unintended Acceleration Episodes
Vehicle experiences unintended acceleration episodes occurring while stopped or at reduced speeds, such as when pulling to a stop or parking.
When: Timing unknown
Symptoms owners cite: Unintended acceleration while stopped; Unintended acceleration at reduced speeds during parking
Synthesized from 10 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 1 most recent
Tl* the contact owns a 2012 Audi a6. The contact was driving 45 MPH when she noticed that the check engine warning light was illuminated on the instrument panel. The vehicle was taken to the dealer for diagnosis where the dealer stated that they needed to replace the transmission oil. The vehicle was repaired but the failure continued. The manufacturer was contacted and stated that they would…
Had engine trouble with your 2012 Audi A6?
File a complaint with NHTSA → It's free, official, and how every report above got here — owner filings are the federal safety record this page is built on.
Common questions
How serious is the engine problem on the 2012 Audi A6?
It's a documented issue but not catastrophic. 10 complaints have been filed. Repairs average $3,100 and most owners catch it before it causes a breakdown.
At what mileage does the engine typically fail?
Based on the 10 complaints filed, engine issues most often appear around 80,150 miles. Some report problems earlier; some make it well past 150,000 with no symptoms. Maintenance habits matter — vehicles that received timely fluid services and were not regularly overworked tend to last longer.
What does it cost to fix?
Independent shops typically charge around $3,100 for engine repairs on this vehicle. Dealer pricing tends to run 20-40% higher. The exact figure depends on the specific failure mode, parts availability, and your local labor rates. If you're outside factory warranty, an extended service contract often covers this category.
Are there any recalls related to engine?
No active recalls currently cover engine issues on this vehicle. The complaints filed represent owner-reported failures that haven't risen to the level of a manufacturer-issued recall — but they're still worth knowing about before you buy or budget for repairs.
Related
Complaint and recall data sourced from the National Highway Traffic Safety Administration (NHTSA)
public records database. Verify the raw federal record at
nhtsa.gov/vehicle/2012/Audi/A6.
Severity ratings are derived from reported crashes, fires, injuries, and fatalities. Repair cost estimates are
independent-shop national averages and may differ in your area. Some links on this page are affiliate links.