IsItAGoodCar
Reliability Guide

Common Problems with the
2025 Peugeot 308 (Mk3)

Unveiled in August 2025, the facelift replaced the 308's vertical fangs with three LED claws and added an illuminated badge on high trims. New colours and wheels aside, the petrol, hybrid and electric line-up carried over largely unchanged.

What changed for 2025

  • •Three-claw LED daytime running lights and a redesigned front bumper
  • •Illuminated Peugeot badge on GT and GT Premium trim
  • •New alloy wheel designs and extra paint colours
  • •1.2 PureTech, 1.5 BlueHDi, PHEV and e-308 powertrains continue

Common MOT watch-outs

  • !Most 2025 cars are not due a first MOT until 2028; watch for delivery damage instead
  • !Headlamp aim and ADAS calibration after front-end cosmetic repairs
  • !Tyre sidewall damage on the larger facelift wheels
3
Known Issues
1
Serious
1
Moderate
1
Minor

All Known Issues

Plug-in Hybrid (PHEV) Traction Battery and On-Board Charger Faults

SeriousElectrics & Electronics

The Hybrid 180 and Hybrid 225 plug-in hybrid models utilize a 12.4 kWh high-voltage lithium-ion battery pack and an integrated on-board charger (OBC). Owners experience unexpected charging halts, charging port locking errors, failure to engage pure Electric mode, and high-voltage isolation fault messages. Rectification requires high-voltage BMS software flashes or physical OBC replacement.

Est. Repair Cost: £600–£2,400
Warning Signs:

Instrument cluster displays "Electric mode currently unavailable" when selected, Charging port LED blinks red and AC charging session disconnects after a few minutes, High-voltage traction electrical fault message illuminated on digital instrument cluster, Traction battery fails to charge beyond minimal level on home wallbox

What to Inspect:
  • Plug vehicle into a Type 2 AC charger and verify continuous charging without disconnection
  • Select pure Electric mode on test drive and check that the petrol engine remains dormant under moderate throttle
  • Verify whether dealer technical service bulletins relating to PHEV battery management have been completed
Verified by IsItAGoodCar Research TeamUpdated

12-Volt Auxiliary Battery Discharge and Phantom Drain

ModerateElectrics & Electronics

The complex networked electronics, telematics module, and proximity keyless entry on the 308 Mk3 create significant parasitic battery drain when parked. If left standing or driven primarily on short urban runs, the 12V auxiliary battery quickly drains below minimum operating voltage, locking out electronic systems and generating multiple false ADAS and stability warnings on startup.

Est. Repair Cost: £140–£320
Warning Signs:

Vehicle fails to unlock via proximity sensor or start without a jump pack, "12V battery low" warning or vehicle enters permanent Economy Mode shutdown, Spurious dashboard warnings for lane assist, front radar, and electronic parking brake, Starter motor clicks repeatedly without cranking the engine

What to Inspect:
  • Test auxiliary 12V battery open-circuit voltage with a multimeter before starting
  • Verify how rapidly central displays initialize when unlocking the driver door
  • Check whether telematics control unit sleep-mode firmware updates have been installed
Verified by IsItAGoodCar Research TeamUpdated

Front Radar and ADAS Sensor Calibration Drift

MinorElectrics & Electronics

The forward-facing radar mounted behind the front grille badge and the camera module mounted in the upper windscreen can lose alignment from minor bumper impacts, road grit, or windscreen replacements. Misalignment causes adaptive cruise control, automatic emergency braking, and active lane keeping to disable intermittently with persistent cluster warnings.

Est. Repair Cost: £200–£550
Warning Signs:

"Front radar sensor blinded" or "Driving aids unavailable" alert displayed in clear weather, Adaptive cruise control disengages abruptly or refuses to activate on dual carriageways, Lane positioning assist wanders within lane or gives false lane-departure tugs, False forward collision emergency alerts triggered by roadside guardrails or bridges

What to Inspect:
  • Examine the front grille badge and windscreen camera aperture for physical damage, stone chips, or misaligned brackets
  • Test adaptive cruise control and lane keep assist systems during a road test
  • Confirm whether the windscreen has been replaced and whether optical calibration was performed
Verified by IsItAGoodCar Research TeamUpdated

Buying Tips for 2025 Peugeot 308 (Mk3)

  • Check the illuminated badge and claw daytime lights work on both sides
  • Confirm the car has the latest infotainment software installed
  • On ex-demo cars, inspect the front bumper and wheels for scuffs
20242026
Check a 2025 Peugeot 308 (Mk3) by Registration