This auto-dimming interior mirror is a direct-fit replacement commonly used on Citroën C4 and Peugeot 307 models. Designed for professional garages and DIY mechanics, it reduces glare from following vehicles at night by automatically adjusting the mirror glass tint, improving driving comfort and safety. The part is frequently searched by its reference numbers, so check the product codes listed below when locating the correct unit.

Technical Information

• Manufacturer: Stellantis (Citroën / Peugeot)
• Model: Citroën C4; Peugeot 307
• Product Codes: 8149EZ, 8154JX, 8149XG
• Additional Numbers: 8149EZ, 8154JX, 8149XG

Compatibility

• Citroën C4 (selected years and equipment levels)
• Peugeot 307 (selected years and equipment levels)

Installation Recommendations

• Disconnect the vehicle battery before removing the old mirror to prevent short circuits when unplugging the electrical connector.
• Remove interior trim as required to access the mirror mounting point and wiring harness. On most models the mirror is fixed to a windshield bracket with a single screw or a clamp; slide the mirror off the mount after loosening fasteners.
• Connect the electrical plug of the new mirror, seat it onto the windshield bracket and tighten the fixing to the correct torque. Refit trim panels and restore battery connection.
• After installation, verify automatic dimming operation by simulating glare (cover the ambient/light sensor briefly) and check any integrated features such as compass or auto-folding if present.
• Use manufacturer-recommended adhesives or brackets when replacing a mirror glued to the glass; allow adhesive curing time before driving.

Why This Part Fails Most Often

Automatic rear-view mirrors usually fail due to electrical or sensor issues. Common causes include internal electronic component degradation from age or heat, water ingress after windshield seal damage, connector corrosion, or damage caused by impacts (e.g., accidents or improper removal). Adhesive or mounting bracket failure can also cause loose or detached mirrors. Addressing wiring corrosion and ensuring proper mounting during installation will reduce the chance of premature failure.

Practical Notes For Buyers

• Search by part numbers (8149EZ / 8154JX / 8149XG) to speed up finding the correct unit.
• Confirm that the replacement mirror matches any integrated functions your vehicle requires (auto-dimming sensor location, electric features, connectors).
• Professional installation is recommended if the mirror is bonded to the windshield or if airbag/trim disassembly is needed.

Description

This interior auto-dimming rear-view mirror is designed as a direct replacement for selected Citroën C4 and Peugeot 307 models. It reduces glare from following vehicles at night by automatically darkening the reflective surface, improving driving comfort and safety. The unit is suitable for professional workshops and experienced DIY mechanics who look for a reliable OE-equivalent part. It is commonly searched and ordered using the product codes 8149EZ, 8154JX and 8149XG, so entering these numbers in search increases the chance of a quick match.

Technical Information

• Manufacturer: Stellantis (Citroën / Peugeot)
• Model(s): Citroën C4 (first generation) and Peugeot 307 (first generation)
• Product Codes: 8149EZ, 8154JX, 8149XG
• Additional Numbers: 8149EZ / 8154JX / 8149XG (common cross-references)

Installation Recommendations

Before starting work, disconnect the vehicle battery to avoid short circuits when unplugging electrical connectors. Typical replacement steps:

• Carefully remove any plastic trim around the mirror.
• Release the mirror from the windshield mount or unscrew the retaining clamp, depending on the original fitting.
• Unplug the electrical connector for the auto-dimming sensor and any integrated functions.
• Fit the new mirror onto the existing bracket and reconnect the electrical connector securely.
• Test the auto-dimming function and adjust mirror position before reassembling trim.

For mirrors that are bonded directly to the windscreen, specialized tools and adhesive are required; consider professional installation to ensure correct bonding and sensor alignment. Protect the windshield and mirror glass during the swap to avoid scratches or damage.

Why It Fails Most Often

Auto-dimming mirrors generally provide long service life, but common failure causes include:

• Moisture ingress or condensation affecting internal electronics or sensors.
• Electrical faults such as connector corrosion, broken wires, or blown fuses.
• Mechanical damage from impact or improper removal/installation.
• Age-related degradation of the dimming cell or adhesive mounting components.

Failures tend to appear more frequently on higher-mileage vehicles or cars exposed to harsh climates and temperature cycles. Replacing a faulty mirror restores night-time comfort and reduces glare-related fatigue for the driver.