Parts for your 2022 Subaru Impreza-Alternator

2022 Subaru Impreza Alternator: What it does and how to look after it

Based on Subaru’s factory service information for the 2017–2023 Impreza (Charging System section) and the owner’s manual descriptions of the charge warning light, the 2022 Subaru Impreza is fitted with a conventional, ECU-controlled alternator. It’s a Denso-style, “smart” unit managed via the battery current sensor to optimise charging. Note: certain overseas Impreza e-BOXER hybrids use a DC-DC converter in place of a traditional alternator, but the non-hybrid 2022 Impreza sold in Australia and New Zealand uses an alternator.

The alternator’s job is to turn engine rotation into electrical power, keeping the 12‑volt battery topped up and feeding everything from headlights and demister to the infotainment. On the 2022 Impreza, it’s a variable-voltage setup, so seeing anywhere from roughly 12.5 to 15 volts at the battery (depending on load, temperature and decel/regen strategy) can be normal.

As part of routine servicing, it’s smart to give the charging system a quick once-over. Under the bonnet, check the drive belt for cracks, glazing or slack