Fitment notes: 12V auxiliary battery; located under cargo floor. Primary traction battery is high-voltage lithium-ion 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 2024-2025 AUDI Q4 E-Tron SUV, AUDI Q4 E-Tron Sportback, and 2024 ID.4 vehicles. The on-board charger (OCDC) may fail and stop charging the 12-volt battery, which can result in a loss of drive power.
Consequence: A loss of drive power increases the risk of a crash.
Remedy: Dealers will replace the OCDC, free of charge. Owner notification letters were mailed on May 20, 2025. Owners may contact Volkswagen customer service at 1-800-893-5298 or Audi customer service at 1-800-253-2834. Volkswagen's number for this recall is 93CJ. Audi's number for this recall is 93FR.
Wiper blades
Continues same specifications as previous model years.
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 2025 Audi Q4 e-tron 40 Single Motor RWD 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.