Toyota Aygo Alternator: Specs, Fitment & Common Faults
On the Aygo, a genuinely useful, free diagnostic test reveals whether a whine is genuinely a bearing fault, not the alternator.
Illustration for editorial purposes
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OEM Part Number: 27060-0Q010 (genuine alternator — confirm via VIN) — aftermarket alternators Valeo 440350 / Hella 8EL 015 659-331
| Alternators (aftermarket) | Valeo 440350 (120 A, freewheel clutch pulley, 6 ribs, 55 mm, remanufactured exchange, £50.24 deposit); Hella 8EL 015 659-331 (100 A, freewheel, 6 ribs, 67 mm, new); Hella 8EL 015 637-881 (80 A, rigid pulley, 6 ribs, 60 mm, new); Lucas LRA03728 (120 A, freewheel, 6 ribs, 54 mm, remanufactured, plug 0296, £50.24 core charge); AS-PL A6599S (100 A, freewheel, 6 ribs, 67 mm, new Standard Line, plug PL_2300, OE 104211-3490); AS-PL A6628S (115 A, freewheel, 6 ribs, 67 mm, new Standard Line, plug PL_2306, OE 104211-3480); AS-PL A3472 (120 A, freewheel, 6 ribs, 54 mm, new Premium Line Valeo-sourced, plug PL_2402, OE 443017); BV PSH 225.574.080.050 (80 A, freewheel, 6 ribs, 60 mm, new +Line Original) |
|---|---|
| Outputs & variants | 80 A on a 6-rib 60 mm pulley (Walker WAL00543 / Stardax STX102332R pattern) is the small-engine unit shared with the previous Aygo; 120-125 A on a 6-rib 54 mm freewheel pulley (Valeo 443017 / SEG F000BL07TV) belongs to the Peugeot 108 and Citroen C1 sister cars with the 1.2 PureTech |
| Genuine (OE) numbers quoted | 104211-3490 (AS-PL A6599S); 104211-3480 (AS-PL A6628S); 443017 (AS-PL A3472 Valeo); F000BL07TV (AS-PL A01316 SEG) |
| Fitment notes | The 1.0 KGB40 takes a Denso unit on the large 67 mm pulley and the 1.2 PAB40 takes a Valeo or SEG unit on a 54 mm pulley, so the two are not interchangeable; the Lucas, Valeo and Walker exchange units carry a £50.24 core charge and the Stardax units £21.94. |
A Genuinely Useful, Free Diagnostic Test Worth Trying — Toyota Aygo Alternator
If you're hearing a whine or grinding noise that might be the alternator, this is genuinely worth trying before condemning the part: with the engine idling, listen to the noise, then progressively add electrical load — headlights, heated rear window, air conditioning. A genuine bearing fault typically gets louder as load increases. It's also worth listening for whether the noise briefly disappears then returns a second or two after decelerating from higher revs — this pattern is a fairly reliable sign of genuine bearing wear.
It's also worth knowing that a breakdown recovery call-out for alternator failure, particularly away from home, can come with a real premium attached.
Toyota Aygo Alternator: Often Blamed on the Battery Instead
On the Toyota Aygo, a weak battery and a failing alternator produce almost identical symptoms at first — dim lights, slow starts, a car that won't hold charge — which is exactly why so many people replace the battery, only to be back at the garage a few weeks later with the real culprit untouched.
Toyota Aygo Alternator: Watch: Replacing It
Same 1.0 1KR-FE car; no 2014-on Aygo alternator replacement video (only belt and cracked-alternator diagnosis).
Toyota Aygo Alternator: What It Does
The Toyota Aygo's alternator generates electricity while the engine runs, charging the battery and powering the car's electrical systems directly. A healthy alternator means the battery is mostly there for starting the engine and covering brief demand spikes — not for actually running the car's electronics on its own.
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Toyota Aygo 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 Toyota Alternator
The same part, covered across other Toyota models.