Fitment notes: Located under cargo floor; AGM battery required for start-stop and energy management system
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Every control module on the 2022-2026 Audi Q4 e-tron — where it lives, replacement time, and what it takes to program a replacement. Modules marked dealer / factory tool won't work after a part swap alone — budget for programming.
Battery Management System Control Module (BMS)8.0 hr R&Rsecurity gateway +1.5 hr▸ programming details
📍 Integrated into high-voltage battery pack, under floor pan
🔧 ODIS-E + Security Gateway access
⚠️ Requires battery pack removal/disassembly. VIN-locked; coding includes cell balancing parameters and capacity calibration. High-voltage safety procedures mandatory.
Rear Motor Control Unit (MCU-R)3.0 hr R&Rsecurity gateway +1.0 hr▸ programming details
📍 Rear motor compartment, mounted on rear electric drive unit (Quattro models only)
🔧 ODIS-E + Security Gateway access
⚠️ Only on Q4 50 e-tron Quattro models. VIN-locked; high-voltage safety procedures mandatory.
Motor Control Unit (MCU)2.5 hr R&Rsecurity gateway +1.0 hr▸ programming details
📍 Front motor compartment, mounted on top of electric drive unit
🔧 ODIS-E + Security Gateway access
⚠️ Controls front electric motor; VIN-locked and requires SGW authentication. Replacement requires dealer-level access or third-party solutions like AutoAuth.
Aftermarket tool coverage varies by software version and vehicle build — treat "aftermarket tool" rows as "usually possible" and verify against your tool maker's coverage list before promising a customer. Spot a wrong location or hour? Tell us — corrections ship fast here.
Volkswagen Group of America, Inc. (Volkswagen) is recalling certain 2025 GTI, Golf R, Audi A5, A6 Sportback E-Tron, S5, S6 Sportback E-Tron, 2026 Q4 Sportback E-Tron, and Q4 E-Tron vehicles. The torsion bar in one or both front seat belt retractors may have been damaged during production.
Consequence: In a crash, a damaged torsion bar in a retractor could fail. If this happens, the seat belt may not properly restrain an occupant during a crash, increasing the risk of injury.
Remedy: Dealers will replace one or both front seat belts, free of charge. Owner notification letters were mailed October 30, 2025, and October 31, 2025. Owners may contact Audi at 1-800-253-2834 or Volkswagen at 1-800-893-5298. Audi's number for this recall is 69UM; Volkswagen’s number for this recall is 694T. Vehicle Identification Numbers (VINs) involved in this recall will be searchable on NHTSA.gov beginning September 26, 2025.
Wiper blades
2026 model follows same platform as 2022-2025 Q4 e-tron generation
Size-standard part numbers — verify your connector type before buying. Rear blades are model-specific; check the package's vehicle list.
Fuel economy figures are EPA data via fueleconomy.gov (median across matching trims). Performance figures are compiled estimates for the 2026 Audi Q4 e-tron 50 quattro Dual Motor AWD and can vary by trim.
🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years and Jeff Moore · Master Lexus & Toyota Mechanic · 20+ years.