Audi A4 Alternator 059-903-016E | 12V 140A | A5 Q5

Product Overview

The 059-903-016E is an OE part number for a 12-volt 140-amp alternator that appears on Audi A4, A5, and Q5 models equipped with V6 diesel engines from the late 2000s through the mid-2010s. The unit was manufactured by Bosch and carries the OE reference 059-903-016E in the VAG parts system, with the product listing also referencing 06F-903-023A as a secondary OE cross.

Cross-reference numbers span multiple OE and aftermarket systems. Bosch OE numbers: 0124525039, 0124525050, 0124525066, 0124525067, 0124525091, 0124525092, 0124525525, 0124525539, 0124525575, 0986045340, 0986048180, 1986A00902, 113992. Valeo numbers: TG14C011, TG14C022, TG14C042, TG14C047. Lucas LRA03185, LRA3185. HC-Parts: CA1782IR. AS-PL: ALB1782AB, ALB1782AN, ALB1782BA, ALB1782DD, ALB1782GB, ALB1782JA, ALB1782K, ALB1782LK, ALB1782NW, ALB1782UX, ALB1782YX, ALB1782RB, ALB1782WA, ALB7782NW, ALB9782DD. Magneti Marelli: ALV1782BA, ALV1782GB, ALV1782MQ, ALV1782RN, ALV1782UX, ALV7782RN. VW Group: 03L903023F, 03L903023FX, 06F903023A, 06F903023AX, 06F903023C, 06F903023CX, 06F903023F, 06F903023FX, 06F903023H, 06F903023HV, 06F903023HX, 06F903023J, 06F903023R, 06F903023RX, 07K903023A. Hella: 8EL011710791, 8EL738192001. Others: DRB5340, DRB5340X, 063535250920, 063535255250, 06373178201, 063731782010, 943317821010, 944390453400, MG64, 210468, 210469, 1800A066, ALT2310, ALT2402, 01240AC00B, 2542695, 2543282, 2607703, 437454, 437526, 439664, 440249, 442030, 38522326F, 1-3216-25W, 11134N, 1294701B0.

This unit is a RENOVATE-grade professionally restored alternator. It carries a one-year warranty, is in current stock, and ships in neutral kraft paper packaging. Lead time is 10 days.

Why the OE Number Is the Right Starting Point, Not a Convenient Label

In most of the automotive aftermarket, part numbers are treated as labels. You find a number you recognise, you order around it, and you assume the rest will work itself out. That approach holds for simple parts on common vehicles. It falls apart on the Audi B8 platform, where the VAG parts catalogue uses the OE number as an actual engineering designation with a precise meaning.

The 059-903-016E is not a vague reference. In the VAG system it describes a specific alternator built to a complete set of parameters: 12 volts, 140 amps, clockwise rotation, a 6PK freewheel pulley, a particular regulator clock position, and a particular mounting configuration. When a Bosch engineer assigned that number in the VAG catalogue, they were encoding a complete specification. The fact that the same physical unit carries Bosch numbers, Valeo numbers, Lucas numbers, AS-PL numbers, and Magneti Marelli numbers - all describing one identical component - is a testament to how thoroughly the industry has cross-referenced this unit.

For shops and buyers, this specificity is an advantage. If the vehicle was maintained at an Audi dealer, the invoice references the 059-903-016E. If it was maintained at an independent workshop using aftermarket catalogues, it might reference the Bosch number or the Valeo number. If it was maintained in a different market with a different catalogue system, it might reference one of the many cross numbers listed in this article. All of these point to the same physical unit. The 059-903-016E is the anchor that makes all of the others navigable.

The RENOVATE grade means the unit has been professionally disassembled, inspected, and rebuilt to OE specifications. Worn components have been replaced and the completed unit has been tested to confirm it delivers 140-amp output at 12 volts. For a B8-generation Audi with a V6 diesel in the 150,000 to 220,000 kilometre range, the RENOVATE grade fills the gap between an unverified used unit and a brand-new production part, at a price point that makes sense for this repair.

Technical Specifications

Engine Compatibility and Cross Reference

The 059-903-016E alternator fits the following Audi models directly. All applications are 3.0-litre V6 turbocharged common-rail diesel engines.

Note: The 059-903-016E is the Bosch-built variant for engines coded CAGA through CJCB. The Valeo-built variant for the same engine application carries the 06F-903-023 series of numbers. Both are 140-amp units and both are correct replacement options for this engine family. The difference lies in the original supplier. Either one is correct for these applications.

What to Look for in a Replacement

The B8-generation Audi with a V6 diesel has a 140-amp alternator as standard OE equipment. That number was not arbitrary. The B8 platform introduced the full MMI Navigation Plus system, four-zone climate control on the Avant, electric tailgate, and Audi Drive Select with adaptive suspension. All of these pushed the vehicle electrical demand well beyond what the earlier B6 and B7 generations ever needed. The 140-amp output is the OE answer to that load, and it is the correct replacement answer for the same reason.

Confirm the freewheel pulley. The 6PK designation refers to the six-rib serpentine belt, but the key feature is the freewheel - or overrunning alternator clutch - built into the pulley. The freewheel allows the alternator to continue rotating at its own speed after the belt tension drops at deceleration, which prevents belt slip under intermittent load changes. A solid pulley on this application will produce belt noise, premature belt wear, and inconsistent charging output. The freewheel function is part of the OE specification and should be present on the replacement.

When sourcing by cross-reference, the 059-903-016E is the primary OE number, and the Bosch 0124525xxx series maps directly to it. If a counter system does not carry the VAG number, the Bosch number in their system will typically resolve correctly. The Valeo TG14C022 is a separate supplier variant for the same application. Different manufacturer, same output, same pulley, same mounting. Both are correct replacement options.

The RENOVATE grade means the unit has been professionally rebuilt: rotor, stator, rectifier, regulator, bearings, and brushes have been inspected and replaced where necessary, and the completed unit has been tested on a load bank to confirm it delivers rated 140-amp output. For a European premium vehicle at this mileage stage, this is the practical middle ground between an untested used core and a new production unit at full retail price.

Before fitting, run the voltage check at 2000 rpm with the climate system on auto, headlights on, and the MMI system active. The reading at the battery terminals should be between 13.8 and 14.4 volts. On the B8 platform, a failing alternator often presents as a flat voltage reading with no obvious battery light. The BMS on these vehicles can mask early charging faults by compensating from the battery, which means the battery light may not appear until the fault is already significant. Catch it with the voltage check before the light shows.

Application Scenarios

• Independent European workshops serving retail Audi A4 and A5 owners with the 3.0 TDI engine, where the charging fault has been diagnosed and the correct 140-amp unit needs to be sourced without a dealer markup.

• Multi-brand operators working across the VAG platform, where the same Bosch alternator is listed under both the Audi OE number and the VW OE cross-reference.

• Fleet and leasing company maintenance operations managing Audi A4 and Q5 vehicles in company car fleets, where the 3.0 TDI is a common powertrain option and the alternator is a predictable maintenance item at this mileage.

• Export and international parts buyers sourcing the 059-903-016E for markets where the B8-generation Audi was sold new and the V6 diesel parc is now entering the high-mileage replacement window.

• Specialist Audi independent workshops that prefer to cross-reference by the OE VAG number when ordering through their parts distributors.

• DIY owners who have identified the charging fault with a multimeter and are sourcing the correct unit before booking the vehicle in for installation.

FAQ

Q: Will this alternator fit my Audi A4 with a 2.0 TDI engine?

A: The 059-903-016E is the OE number for the 3.0 V6 TDI application. The 2.0-litre four-cylinder TDI engines on the B8 platform use a different alternator specification, typically a 120-amp unit with a different part number. Confirm your engine code before ordering. If the code is CAGA, CAGB, CAHA, CAHB, CMEA, or CJCB, this unit fits.

Q: What is the difference between the Bosch and Valeo versions of this alternator?

A: Both the Bosch and Valeo versions are OE suppliers for this application and both produce 140-amp units with a 6PK freewheel pulley. The difference is the original manufacturer. VAG sourced from both Bosch and Valeo during the B8 production run. The Bosch version carries the 0124525xxx series of numbers; the Valeo version carries the TG14C0xx series of numbers. Either one fits the same application.

Q: The cross-reference list has dozens of different numbers. How do I know I am ordering the right one?

A: All of the numbers in the cross-reference list - the VAG OE numbers, the Bosch numbers, the Valeo numbers, the Lucas number, the HC-Parts number, the AS-PL numbers, the Magneti Marelli numbers, and the Hella numbers - all describe the same physical 140-amp Bosch alternator for this application. If a counter system returns any of these numbers, the part is correct. The 059-903-016E is the most specific VAG reference; the Bosch 0124525xxx series is the most widely carried aftermarket reference.

Q: My car is an Audi Q5 3.0 TDI. Will this unit fit?

A: Yes. The Q5 8RB with the 3.0-litre V6 TDI engine uses the same alternator specification as the A4 B8 and A5 for this engine type. Engine codes CAGA, CAGB, CAHA, CAHB, CMEA, and CJCB appear in the Q5 application as well as the A4 and A5. Confirm the engine code and if it matches this range, the replacement is correct.

Q: What does RENOVATE mean for an alternator, and how does it compare to a used core?

A: RENOVATE means the unit has been professionally disassembled, inspected, and rebuilt to OE specifications, with worn components replaced and the completed unit load-tested to confirm it delivers 140-amp output at 12 volts. This is distinct from a used core, which has been pulled from a vehicle of unknown history and condition. A RENOVATE unit has been verified to work before it ships. The one-year warranty covers the repair. For a B8-generation Audi in the 150,000 to 220,000 kilometre range, this is the practical choice: quality above a used core, cost below a new production unit.

Q: I see this alternator also listed for VW Passat and Skoda Octavia. Are those the same units?

A: The VAG Group uses the same alternator design across multiple platforms and brands. The 3.0 V6 TDI engine appears in some VW Passat and Skoda Superb applications with closely related part numbers. The cross-reference list reflects this broader application range. For the Audi A4, A5, and Q5 specifically, the OE number 059-903-016E is the correct primary reference and the replacement will fit without modification.

Q: Is 10 days lead time standard for this part?

A: The unit is in current stock and the 10-day lead time reflects the RENOVATE processing and quality verification before shipping. For urgent situations, contact the supplier to confirm whether a faster dispatch option is available.

In Practice

The independent European workshop with a mix of German premium vehicles faces a familiar situation. A 2011 Audi A4 Avant 3.0 TDI arrives with a battery warning light and a voltage reading of 12.4 volts at idle. The diagnosis is straightforward: the alternator is not charging. The question is which number to use when ordering the replacement. The OE number on the old unit is 059-903-016E. The workshop parts software shows the Bosch number 0124525091 in stock. Both are the same physical unit. The RENOVATE grade keeps the customers invoice reasonable and the one-year warranty gives the shop a clear warranty path.

For the fleet manager running a portfolio of Audi and VAG Group vehicles, the RENOVATE 140-amp alternator for the B8 V6 TDI is a recurring line item at this stage of the vehicle lifecycle. The key data point for procurement is the full cross-reference range. Having both the VAG OE number and the Bosch aftermarket number in the ordering system means the parts team can source from either channel depending on which distributor has the better price and lead time on any given day.

For the technician, the A4 B8 alternator job is a two-hour procedure. The B8 platform is more spacious than the earlier B6 and B7 generations, and the 3.0 TDI engine bay gives enough room to get hands and tools in without excessive contortion. The RENOVATE unit arrives pre-tested. No bench testing required, just bolt it in, connect the B+ terminal and the LIN/COM plug, tension the belt, and verify the voltage at the battery.

About the Author

Klaus Hartmann is an automotive engineering consultant based in Graz, Austria, with 17 years of experience in European powertrain aftersales and VAG Group platform logistics. He began his career at a Graz-based automotive engineering consultancy that worked with tier-one suppliers to the Volkswagen Group, and spent his first five years specialising in electrical charging systems and powertrain electronics for VW, Audi, and Skoda applications across the PQ35 and PQ46 platform generations.

He holds a degree in automotive engineering from FH Joanneum in Graz, with a specialisation in vehicle electrical systems. During his time at the consultancy, he worked on several projects mapping the cross-reference relationships between OE part numbers and aftermarket equivalents for charging system components. This gave him direct exposure to how the same physical alternator carries different numbers in different catalogue systems depending on whether the catalogue is organised by OE reference, by manufacturer, or by vehicle brand.

He now works independently as a technical consultant for European aftermarket distributors and independent workshops who handle VAG Group vehicles. The 059-903-016E alternator appears regularly in his work: the B8-generation Audi A4, A5, and Q5 with the 3.0 V6 TDI engine has been in the field long enough that the charging system is now a routine replacement item, and shops who understand the cross-reference network are the ones who can source this part quickly regardless of which catalogue system their distributor uses.