Audi A4 A5 Q5 Bang & Olufsen MMI 3G MOST Amplifier - Genuine OEM 8T1035223A

Replace a faulty or damaged factory sound-system amplifier with this Genuine OEM Audi Bang & Olufsen amplifier, part number 8T1035223A.

This digital sound-system control module is designed to operate with compatible Audi MMI 3G or MMI 3G+ infotainment systems and transmit audio-system data through the vehicle's MOST fibre-optic network.

Product Features

• Genuine OEM Audi audio component
• Audi part number 8T1035223A
• Alternative part number format 8T1 035 223 A
• Bang & Olufsen premium sound-system amplifier
• Digital sound-system control module J525
• Designed for compatible MMI 3G and MMI 3G+ systems
• Compatible with a factory MOST fibre-optic network
• Suitable for selected Audi A4, A5 and Q5 models
• Original factory connectors and mounting design

Common Symptoms of a Faulty Amplifier

• No sound from some or all speakers
• Distorted, crackling or intermittent audio
• MMI system operates without audio output
• Amplifier disappears from the MOST communication network
• Sound-system or control-module fault codes are stored
• Audio system stops operating after moisture or water damage

Vehicle Compatibility

This amplifier may be suitable for selected Audi A4, A5 and Q5 vehicles equipped with a compatible factory Bang & Olufsen sound system and MMI 3G or MMI 3G+ infotainment equipment.

Compatibility can vary depending on the vehicle model, production year, factory audio option, MMI version, software level, speaker configuration and electrical connections. Please compare part number 8T1035223A and all additional identification numbers with the original amplifier before purchasing.

Coding and Programming Requirements

Coding, parameterisation and component-protection removal will generally be required when installing this amplifier into a different vehicle.

The replacement unit may need to be commissioned using Audi-compatible diagnostic equipment with authorised online access. Software configuration, SVM parameterisation, sound-system adaptation and diagnostic fault-code clearing may also be required.

A matching used amplifier should not be considered guaranteed plug-and-play. If the vehicle's original amplifier is repaired and reinstalled into the same vehicle, component-protection removal is not normally required.

Installation Information

Professional installation by an Audi technician or experienced automotive infotainment specialist is recommended.

The vehicle should be scanned before installation to confirm the original fault. The MOST fibre-optic connections, power supply, wiring and amplifier mounting area should also be inspected for corrosion, moisture or water damage.

After installation, the complete sound system and MOST communication network should be tested to confirm correct operation.