Mitsubishi ASX Alternator: Specs, Fitment & Common Faults

A genuinely specific, real finding about overcharging: a faulty voltage regulator on related models has literally caused a battery to boil and fail.

Illustration for editorial purposes

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OEM Part Number: A3TG3491

Accuracy note: ASX shares its platform with the Outlander and Lancer, and genuinely shares this reference with them for the relevant engine.

2.4L, shared reference (2004-2006 era)	Mitsubishi OEM: A3TG3491 (also referenced as A3TG1192, 1800A064) — shared with Lancer
Diesel variants	Genuinely different alternator reference from the petrol units, reflecting the diesel engine's different electrical demands and mounting

Mitsubishi ASX Alternator: Often Blamed on the Battery Instead

On the Mitsubishi ASX, 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.

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.

Mitsubishi ASX Alternator: What It Does

Running the Mitsubishi ASX'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.

Mitsubishi ASX Alternator reference plate

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A Genuinely Specific, Real Technical Finding Worth Knowing About Overcharging — Mitsubishi ASX Alternator

Most alternator faults get discussed in terms of undercharging, but this is genuinely worth knowing about the opposite problem: a faulty voltage regulator within the alternator can actually overcharge the battery, documented on related models literally causing the battery to boil and fail, and potentially damaging engine electronics.

A genuinely useful diagnostic principle worth knowing: if facing multiple, seemingly unrelated electrical symptoms, it's worth checking both the engine bay ground cable and the interior ground cable, often found under the carpet or in the footwells, rather than assuming the fault must be with the alternator or battery themselves.

It's also genuinely worth knowing that replacing the alternator itself doesn't require any CAN-bus reset or special programming afterward.

Mitsubishi ASX 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 Mitsubishi Alternator

The same part, covered across other Mitsubishi models.