Audi A5 Coupe Alternator: Specs, Fitment & Common Faults
On the A5, a broomstick technique can genuinely help isolate whether a noise comes from the alternator, before assuming a battery replacement will fix it.
Illustration for editorial purposes
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Often Blamed on the Battery Instead
On the Audi A5 Coupe, dim lights, slow starts, a battery that won't hold charge — these symptoms point equally to a weak battery or a failing alternator, and that overlap is why so many replacements target the wrong part first, with the real problem only surfacing weeks later.
OEM Part Number: 06B903016AC (genuine alternator — confirm via VIN) — aftermarket alternators Lucas LRA03152 / AS-PL A0567S2
| Alternators (aftermarket) | Lucas LRA03152 (180 A, freewheel pulley, 6 ribs, 49 mm, remanufactured, LIN2A plug, core charge £25.12, Valeo-built originals only); Lucas LRC00009 (210 A, multi-rib rigid pulley, 6 ribs, 56 mm, remanufactured, core charge £75.36); AS-PL A0567S2 (150 A, freewheel, 6 ribs, 56 mm, new, plug PL_2306); AS-PL A0576S (150 A, freewheel, 6 ribs, 49.5 mm, new, plug PL_2306); AS-PL A0492 (180 A, freewheel, 6 ribs, 50 mm, new, plug PL_2306); AS-PL A0607S (180 A, freewheel, 6 ribs, 49.5 mm, new, plug PL_2306); AS-PL A3486S (180 A, freewheel, 6 ribs, 56 mm, new, plug PL_2306); BV PSH 305.987.150.500 (150 A, freewheel, 6 ribs, 50 mm, new Valeo-built unit, B+ M8). |
|---|---|
| Outputs & variants | 150 A units (AS-PL A0567S2, A0576S, A0551S, BV PSH 305.987 series) cover the 2.0 TFSI petrol engines, while 180 A units (Lucas LRA03152, AS-PL A0492, A0607S, A3486S, Rotovis 9090811) suit the 2.0 TDI, 3.0 TDI and higher-spec petrols. A 210 A Lucas LRC00009 and a 48 V 250 A Stardax STX110089R belt starter-generator are listed for the mild-hybrid cars. Every 12 V unit with a stated pulley type uses a freewheel pulley; pulley diameters split between roughly 49-50 mm and 56 mm. |
| Genuine (OE) numbers quoted | 0125711090 (AS-PL A0567S2), FG18T079 (AS-PL A3308S), 0121715077 (AS-PL A0492), 0125811035 (AS-PL A0607S), FG20S015 (AS-PL A3486S), 0125711034 (AS-PL A0551S), 0125711130 (AS-PL A0576S), 0125711187 (AS-PL A01291), F000BL08DF (AS-PL A01256). |
| Fitment notes | Bosch and Valeo both supplied original alternators for this car and the two are not interchangeable, so the pulley diameter and plug of the old unit should be matched; the 48 V mild-hybrid starter-generator is a separate part and cannot be replaced with a standard alternator. Remanufactured Lucas units carry a core charge refunded on return of the old unit, and the AS-PL A0567PR exchange unit is supplied without a deposit. |
Alternator output varies between the four-cylinder TFSI/TDI engines and the six-cylinder S5/RS5, given their different electrical demands — confirm your exact engine before ordering.
Audi A5 Coupe Alternator: What It Does
Electricity generation while the Audi A5 Coupe's engine is running is the alternator's job, charging the battery and directly powering the electrical systems. When it's working properly, the battery mostly just handles engine starting and short demand spikes, not day-to-day electrical load.
Audi A5 Coupe Alternator: Watch: Replacing It
Same MLB-evo platform and 2.0 TFSI layout as the F5 A5; no A5-specific video found.
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A Genuinely Useful Piece of Context Worth Knowing About Alternator Diagnosis — Audi A5 Coupe Alternator
If you're trying to confirm whether a noise is genuinely coming from the alternator, this is genuinely worth trying: touching one end of a wooden broomstick to the alternator housing, with the other end held close to your ear, can help you hear the noise much more clearly.
It's also genuinely worth knowing that related Audi models fitted with the 48V mild hybrid system have documented alternator failures specifically tied to this system, with a confirmed US extended warranty covering the issue.
Audi A5 Coupe Alternator: Warning Signs, DIY Difficulty & Aftermarket Advice
These are the same regardless of make or model — see our full Alternator Guide for symptoms to watch for (plus a genuinely useful two-minute test to confirm it's not the battery instead), confirming the right amperage and fitment against your VIN, and which brands are worth trusting.
More Audi Alternator
The same part, covered across other Audi models.