Mazda 2 Alternator: Specs, Fitment & Common Faults
On the Mazda 2, a "Charging System Malfunction" message is often genuinely a software glitch, not a true hardware failure.
Illustration for editorial purposes
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OEM Part Number: ZJ38-18-300 (genuine alternator — confirm via VIN) — aftermarket alternators Bosch 1 986 A00 631 / Lucas LRA03875
| Alternators (aftermarket) | Bosch 1 986 A00 631 (100 A, rigid multi-rib pulley, 6 ribs, 51 mm, new, plug 139, excludes vacuum pump); Bosch 0 986 084 990 (100 A, rigid multi-rib pulley, 6 ribs, 51 mm, remanufactured exchange, plug 139, core charge £24.86); Lucas LRA03875 (100 A, 6 ribs, 51 mm, remanufactured, plug 0200, core charge £50.24); Lucas LRA04006 (150 A, 6 ribs, 51 mm, remanufactured, plug 0314, core charge £25.12); AS-PL A5337 (100 A, 6 ribs, 51 mm, new, plug PL_3310); AS-PL A5616S (100 A, 6 ribs, 51 mm, new, plug PL_3310); BV PSH 145.564.150.130 (150 A, freewheel pulley, 6 ribs, 51 mm, new). |
|---|---|
| Outputs & variants | 100 A six-rib 51 mm rigid-pulley units with a P/D two-pin plug are the standard fit for the 1.5 Skyactiv-G petrol; 80-90 A listings are older-generation carry-overs. |
| Genuine (OE) numbers quoted | A5TL0491 (AS-PL A5337); A5TJA091 (AS-PL A5616S); A5TA7792 (AS-PL A5029). |
| Fitment notes | Check the plug before buying because the 100 A petrol unit uses a two-pin P/D plug while the 150 A unit uses a different four-pin plug; remanufactured Bosch and Lucas units carry a core charge of £25-£50 which is refunded on return of the old unit. |
A Genuinely Important Warning Worth Knowing Before Replacing the Alternator — Mazda 2 Alternator
If you're seeing a "Charging System Malfunction" or "Low Battery Risk" warning message, particularly on a relatively new car, this is genuinely worth knowing: this specific warning has been widely reported as often being a software sensitivity issue related to the Body Control Module, rather than a genuine hardware failure. It's worth asking a dealer directly whether a relevant software fix exists before assuming the alternator needs replacing.
It's also worth knowing that alternator fitment is genuinely more complex than it might first appear — the correct part depends on engine size, the specific transmission fitted, and whether the engine has cylinder deactivation.
Mazda 2 Alternator: Often Blamed on the Battery Instead
On the Mazda 2, it's genuinely hard to tell a weak battery from a failing alternator just from symptoms — both produce dim lights, slow starts, and a battery that won't hold charge. That's exactly why so many people end up replacing the wrong part, then returning to the garage a few weeks later.
Mazda 2 Alternator: Watch: Replacing It
DE Mazda 2; no DJ Skyactiv video found
Mazda 2 Alternator: What It Does
Running the Mazda 2's electrical systems and keeping the battery charged while the engine turns over — that's the alternator's role. A properly functioning one means the battery only really needs to worry about starting the car and absorbing occasional spikes in demand.
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Mazda 2 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 Mazda Alternator
The same part, covered across other Mazda models.