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.

Generation covered: this guide is for the second-generation A5 Coupe (F5 platform, 2016–2024) — the two-door coupe discontinued when Audi renamed the A4 saloon to A5 in 2024. These are entirely different cars despite sharing a name; if your car is a four-door saloon or estate bought new since 2024, this guide does not apply to it. Check your logbook or VIN if you're unsure which car you have.

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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.

Before you buy: alternator output rating varies by engine size and trim, particularly on cars with more onboard electronics. Always confirm against your VIN before ordering.

OEM Part Number: 06B903016AC

Genuinely worth knowing: A5 shares its platform and electrical architecture with the related A4 — the same 06B903016AC reference (150 Amp, 1.8T/2.0T) applies to equivalent-generation A5 engines, though confirm your exact engine code before ordering.

Shared A4-platform reference, 1.8T/2.0T, 150 Amp	Audi OEM: 06B903016AC (also referenced as 06D903016X)
Diesel/higher-output variants	Genuinely different, typically higher-amperage alternator references apply to diesel engines and higher-performance variants — confirm your exact engine code before ordering

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 reference plate

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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.

A genuinely important, real account worth knowing before replacing another battery: going through more than one battery in a short period is a strong sign the alternator isn't charging properly, worth testing its actual voltage output directly with a multimeter rather than continuing to replace batteries — a healthy reading with the engine running should be roughly 13.8 to 14.8 volts.

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.