Audi TT MK2 CDA 1.8T Alternator 06J 903 023 Q - Used Original Parts

Diagnosis and Common Symptoms

From a workshop perspective, a failing alternator on the VAG 1.8T/2.0T platform presents with clear, escalating symptoms. Initially, you may notice intermittent flickering of interior or exterior lights. As the unit degrades, the red battery warning light will illuminate on the instrument cluster, often accompanied by a "Generator Fault" message. In advanced stages of failure, the vehicle's ECU will begin shedding electrical load, causing systems like power steering to feel heavy or the radio to shut down.

Common diagnostic trouble codes (DTCs) logged in the gateway or engine control module include:

• 02252 - Generator
• 01117 - Generator Terminal DF Load Signal
• 00446 - Function Limitation due to Under-Voltage

A physical inspection may reveal a whining or grinding noise from the alternator bearings, especially upon start-up or under heavy electrical load.

Introduction

Sourcing reliable electrical components is critical for any repair. This is a Genuine Used alternator, originally manufactured by Valeo for Audi. Each unit we supply has been removed from a donor vehicle and subjected to rigorous bench testing to confirm stable voltage output and correct amperage under load. It provides a dependable, factory-spec solution without the expense of a new part.

Product Details

• Brand: Valeo (Genuine VAG Supplier)
• Model Compatibility: Audi TT MK2 (8J), A3 (8P), and other models with the 1.8T CDA/CDAA engine (Approx. 2008-2015).
• Part Name: Alternator (Generator)
• Part Number: 06J 903 023 Q
• Amperage: 140A
• Condition: Genuine Used (Tested Working)
• Notes: Unit has been load-tested to verify consistent voltage regulation. The clutch pulley and bearings have been inspected for noise-free, smooth operation. We strongly advise testing and fully charging your vehicle's battery prior to installing a replacement alternator.