Audi A4 A5 B8 8T 8R Bluetooth Module 8T0862335F - Used Original Parts

Diagnosis and Common Symptoms

From a workshop perspective, failure of the J794 (Information Electronics Control Module 1) sub-system for telephone functionality is a common issue on the B8 platform. The primary symptom is a complete loss of Bluetooth connectivity, often accompanied by an MMI (Multi Media Interface) message stating "Telephone is not installed" or "Telephone not available." The phone menu may be greyed out or cause the entire MMI system to lag or freeze.

A diagnostic scan with a capable tool like VCDS or ODIS will typically reveal fault codes pointing directly to the telephone control module. Key codes include:

• 02748 - Control Module for Telephone (J412): Defective
• 03157 - Functionality limited due to Communications Disruption
• No Communication with Telephone Control Module

Physically, the module is often located under the passenger seat carpet, making it highly susceptible to water ingress and corrosion, which is the leading cause of internal circuit failure.

Introduction

Restore seamless connectivity to your Audi with this Genuine Used Bluetooth Module. Each unit is meticulously sourced from a donor vehicle and subjected to rigorous bench testing to confirm full operational integrity. This part provides a cost-effective solution to reinstate the vehicle's original hands-free telephone functionality without compromising on quality or system integration.

Product Details

• Brand: Audi
• Model Compatibility: A4 / A5 / Q5 (B8 Platform, approx. 2008-2016)
• Part Name: MMI Telephone Control Module (Bluetooth Interface)
• Condition: Genuine Used (Tested Working)
• Notes: Verify part number 8T0 862 335 F matches your vehicle's original module. Failure is often due to water damage; ensure the installation area is dry before fitting the replacement. Component Protection may need to be removed by a qualified technician.