BMW X5 Alternator: Specs, Fitment & Common Faults
On the X5, a leaking oil filter housing gasket has genuinely been documented as a primary cause of alternator failure on related engines.
Illustration for editorial purposes
Opens live listings in a new tab.
OEM Part Number: 12318634167 (genuine alternator — confirm via VIN) — aftermarket alternators Bosch 0 986 084 960 / Valeo 437498
| Alternators (aftermarket) | Bosch 0 986 084 960 (220 A, multi-rib pulley, 6 ribs, 53.5 mm, remanufactured exchange, plug ID 125, core charge £24.86, excludes vacuum pump); Valeo 437498 (180 A, V-ribbed pulley, 6 ribs, 52 mm, remanufactured exchange, three-point mounting, core charge £50.24); Denso DAN1135 (210 A, multi-rib pulley, 8 ribs, 49 mm, new); Denso DAN1469 (210 A, multi-rib pulley, 6 ribs, 48 mm, new); Hella 8EL 011 713-651 (220 A, freewheel, 6 ribs, 54 mm, new); AS-PL A6342 (210 A, freewheel, 6 ribs, 48 mm, new, plug PL_2306); AS-PL A6424S (170 A, freewheel, 6 ribs, 48 mm, new, plug PL_2306); AS-PL A3457S (220 A, freewheel, 6 ribs, 54 mm, new, plug PL_2306) |
|---|---|
| Outputs & variants | Outputs run from 170 A to 230 A. 170 A and 180 A units (AS-PL A6424S, Valeo 437498, AS-PL A3228) suit the sDrive25d and xDrive25d four-cylinders; 210 A units cover the xDrive30d, xDrive35i and xDrive40e, with the eight-rib Denso DAN1135, Ridex 4G1143 and AS-PL A6404S for the six-cylinder petrols; 220 A and 230 A (Bosch 0 986 084 960, Hella 8EL 011 713-651, AS-PL A3457S and A3143, Rotovis 9090862) suit the xDrive40d, M50d, xDrive50i and X5 M. Both six- and eight-rib pulleys appear at 210 A, so rib count is the quickest check. |
| Genuine (OE) numbers quoted | 021080-1150 (AS-PL A6342), 439833 (AS-PL A3143 Valeo-built version), FG23S068 (AS-PL A3143), 104210-6500 (AS-PL A6404S), FG23S033 (AS-PL A3457S), TG17C027 (AS-PL A3228), 104210-6393 (AS-PL A6424S). |
| Fitment notes | Bosch, Valeo and Denso alternators were all fitted across this range with pulley diameters from 48 mm to 54 mm and mixed freewheel and rigid pulleys, so the old unit must be matched on rib count, pulley size and plug; the Bosch and Ridex units are supplied without the vacuum pump, and the remanufactured Bosch and Valeo units carry a core charge refunded on return of the old alternator. |
BMW X5 Alternator: Often Blamed on the Battery Instead
On the BMW X5, 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.
BMW X5 Alternator: What It Does
Electricity generation while the BMW X5'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.
BMW X5 Alternator: Watch: Replacing It
covers belt too
Opens live listings in a new tab.
A Genuinely Important, BMW-Specific Finding Worth Knowing — BMW X5 Alternator
If this alternator has failed, this is genuinely worth checking before fitting a replacement: a leaking oil filter housing gasket has been documented as a primary cause of alternator failure on related BMW engines, since leaking oil can drip directly onto the alternator and cook its internal components.
It's also genuinely worth knowing that when replacing the alternator, it's wise to also change the serpentine belt, tensioner, and idler pulley at the same time, particularly if they're oil-soaked or high-mileage.
BMW X5 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 BMW Alternator
The same part, covered across other BMW models.