Mercedes-Benz CLA Wing Mirror: Specs, Fitment & Common Faults
A genuinely important, technical finding: the mirror fold circuit uses just two wires with reversed polarity on related models — if a mirror folds one way but not the other, this rules out a broken wire, pointing to the switch instead.
Illustration for editorial purposes
OEM Part Numbers
More Electronics Hiding Inside Than Most People Realise
A wing mirror looks like a simple piece of glass and plastic from the outside, but on most modern cars it houses folding motors, heating elements, indicator lights, and sometimes blind-spot sensors — meaning a "faulty mirror" can mean several genuinely different things.
Driver's Side or Passenger Side? Sorting Out the Terminology
Wing mirrors are sold by side, and UK retailers, workshops and part catalogues don't always use the same terms for the same side — so it's worth being clear before you order. In right-hand-drive UK cars:
- Driver's side = right-hand (RH) = offside (OS) — the side closest to the centre of the road.
- Passenger side = left-hand (LH) = nearside (NS) — the side closest to the kerb.
Part listings may use any of these terms interchangeably — "RH mirror," "offside mirror," and "driver's side mirror" all refer to the same physical part on a UK-spec CLA. Double-check which convention your supplier is using before ordering, since a mix-up here is one of the most common reasons the wrong mirror turns up.
What It Does
Beyond the obvious job of rear visibility, modern wing mirrors on higher trims of the CLA often integrate turn signal repeaters, puddle lights, heating elements to clear condensation, and power-fold motors for tight parking spaces. Higher-spec versions may also house blind-spot monitoring sensors, making them considerably more expensive to replace than a basic mirror.
Fitment & Compatibility
Mirror specification differs substantially by trim level on the CLA — a basic manual mirror and a heated, power-folding, sensor-equipped version are not interchangeable even though they may look similar from a distance. Always confirm the exact specification fitted to your specific trim before ordering, ideally by referencing your VIN rather than assuming based on the visible features. Whether you're sourcing a replacement wing mirror for your Mercedes-Benz CLA from a dealer, specialist, or online marketplace, always check compatibility against your registration or VIN before buying, and confirm you're ordering the correct side — driver's side (RH in the UK) or passenger side (LH in the UK) — since these are not interchangeable.
Common Faults
Symptoms Worth Knowing
- Mirror won't fold or unfold — usually a failing fold motor rather than a wiring fault, though worth checking the fuse first.
- Indicator repeater not working — often a simple bulb or LED failure, though integrated units may require replacing the whole mirror glass assembly.
- Heating element not clearing condensation — can indicate a failed heating element or a blown fuse specific to that circuit.
- Cracked or shattered housing — usually impact damage, and a straightforward like-for-like replacement in most cases.
DIY Replacement Difficulty
Replacing the mirror glass alone is usually an easy DIY job on most versions. Replacing the entire mirror housing is more involved, typically requiring removal of an interior door panel trim piece to access the wiring connector, and blind-spot sensor-equipped mirrors may need recalibration afterward. Expect 15–30 minutes for a glass-only swap, or up to an hour for a full housing replacement.
A Genuinely Important, Technical Finding Worth Knowing
If a mirror will fold in one direction but genuinely won't move the other way, this is genuinely worth knowing: the mirror fold mechanism uses just a simple two-wire circuit on related models, with the polarity reversed depending on fold direction. This means a broken wire can be genuinely ruled out if the mirror works in one direction but not the other, since a broken wire would prevent both directions from working — this instead points toward the switch itself.
It's also genuinely worth knowing that a battery disconnect or proper diagnostic reset has resolved intermittent auto-fold glitches in documented cases, where the setting shows as enabled but the mirrors stop responding to it.
OEM vs. Aftermarket
For basic, non-electronic mirrors, reputable aftermarket parts are a perfectly reliable, cheaper alternative to OEM. For mirrors integrating blind-spot sensors or advanced electronics, OEM parts are strongly recommended given the calibration and compatibility risks involved with aftermarket sensor-equipped units.
More Mercedes-Benz Wing Mirror Guides
The same part, covered across other Mercedes-Benz models.