Toyota Yaris Alternator: Specs, Fitment & Common Faults
On the Yaris, 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: 27060-21151 (genuine alternator — confirm via VIN) — aftermarket alternators Denso DAN1094 / Hella 8EL 011 712-841
| Alternators (aftermarket) | Lucas LRA04453 (85 A, freewheel pulley, 4 ribs, 57 mm, remanufactured, plug 0238 COM/LIN2, core charge £30.14); Lucas LRA03355 (90 A, rigid multi-rib pulley, 6 ribs, 60 mm, remanufactured, plug 0247, core charge £25.12); Lucas LRA04340 (100 A, freewheel pulley, 4 ribs, 62 mm, remanufactured, plug 0247, core charge £50.24); Denso DAN1094 (100 A, freewheel pulley, 6 ribs, 58 mm, new, OE quality); Denso DAN1093 (100 A, 4 ribs, 63 mm, new, OE quality); Hella 8EL 011 712-841 (100 A, freewheel pulley, 6 ribs, 55 mm, new, fitting by qualified personnel); AS-PL A6250 (100 A, freewheel pulley, 4 ribs, 62.5 mm, new, plug PL_1100, Denso pattern); AS-PL A6061 (100 A, freewheel pulley, 6 ribs, 55 mm, new, plug PL_4002). |
|---|---|
| Outputs & variants | Outputs run from 85 A and 90 A up to 100 A. The clearest physical split is the belt pattern: a four-rib 57-63 mm pulley (Lucas LRA04453, LRA04340, Denso DAN1093/DAN1491, AS-PL A6250, BV PSH 195.975.100.050) against a six-rib 55-60 mm pulley (Denso DAN1094, Hella 8EL 011 712-841, AS-PL A6061, Lucas LRA03355). Most are freewheel, but Lucas LRA03355 and Stardax STX101596 use a rigid pulley. |
| Genuine (OE) numbers quoted | AS-PL A6250 for OE DAN1093; AS-PL A6061 for OE 104210-2180; AS-PL A6468S for OE 104211-3050. |
| Fitment notes | the four-rib and six-rib patterns are not interchangeable, so count the ribs on the old belt before ordering, and note the 1.5 Hybrid uses no conventional alternator at all. Lucas advises comparing the OE number on the old unit before fitting. Exchange units carry core charges of £25.12 to £50.24 on top of the price, refunded when the old alternator is returned. |
A Genuinely Useful, Free Diagnostic Test Worth Trying — Toyota Yaris 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 Yaris Alternator: Often Blamed on the Battery Instead
Early on, a weak Toyota Yaris battery and a dying alternator look almost identical — dim lights, sluggish starts, a car that won't hold its charge — which is exactly why so many people fit a new battery and end up back at the garage weeks later, the actual fault still unaddressed.
Toyota Yaris Alternator: Watch: Replacing It
1.3 petrol, covers water pump too
Toyota Yaris Alternator: What It Does
On the Toyota Yaris, while the engine runs, the alternator generates the electricity that charges the battery and powers the car's electrical systems directly. With a healthy alternator, the battery's real job becomes starting the engine and covering brief demand spikes, rather than running the electronics on its own.
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Toyota Yaris 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.