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Cracked Right Mirror Cap on Your 2019–2020 Altima? Here's the Fix

A broken passenger-side mirror cap looks worse than it is — you don't need a full mirror assembly. The White Color Front Right Side Car Mirror Cap Cover for 19–20 Nissan Altima is a precision shell that clips over the existing housing and restores the factory look.

It's injection-molded from high-durability ASA/ABS co-polymer, mounts with the OEM retention-clip design, and cross-references to Nissan Genuine Part No. 96374-6LB0A (Right Side). Quick facts first:

• Position: Front Right (Passenger Side)
• Fitment: 2019–2020 Nissan Altima (L34) — all trims: S, SR, SV, SL, Platinum
• OEM cross-reference: Nissan Genuine 96374-6LB0A
• Color match: Nissan QAB (Glacier White) / QAA (Pearl White Tricoat)
• Installation: Direct clip-on — no adhesive, no tools

See Specs & Order the Mirror Cap

Model-year check: 2019–2020 only

This cap is built for the pre-facelift L34. Nissan revised the mirror housing at the 2021 mid-cycle refresh, shifting clip-anchor spacing by roughly 1.8mm. For 2021–2026 Altimas the matching genuine number is 96374-6LB5A — this cap won't seat correctly on those housings.

The parts catalog ties 96374-6LB0A to L34 VINs in the 1N4BL4**KC****** range. If your VIN doesn't start with 1N4BL4, match the number molded on the back of your old cap before you order.

Cross-referencing a different number? Koeep also lists the Front Right Side Car Mirror Cap Cover Fits 96373-6CA9A 19–20 Nissan Altima for the same cars — useful when the casting on your old cap carries a different right-side number.

What the ASA/ABS Blend Buys You

The 2026 aftermarket has shifted toward co-polymer blends that balance impact toughness with thermal dimensional stability. This cap's ASA-infused ABS matrix has a Vicat softening point above 105°C — headroom you want on a door mirror parked in direct summer sun.

Cold-climate toughness

Against 2024-era commodity ABS, this blend shows a 32% improvement in ISO 179 Charpy notched impact resistance at −30°C, with a floor of ≥8.5 kJ/m². That targets the cold-climate brittleness failures commonly reported in northern-tier states and Canadian provinces, where a light tap or ice buildup cracks brittle caps.

UV and color stability

White pigmentation uses TiO₂ masterbatch at 4.2% loading, stabilized with HALS (Hindered Amine Light Stabilizers). After 2,500 hours of xenon-arc weathering per SAE J2527, color shift stays at Delta-E ≤1.8 — the cap will not yellow on its own.

Factory-grade color control: at manufacture, the finish is validated against Nissan QAB Glacier White and QAA Pearl White Tricoat on a Konica Minolta CM-700d spectrophotometer, with a maximum allowable Delta-E of 1.5 against the OEM standard.

Technical Specification Matrix

Use this matrix as your pre-order verification checklist — every value comes from the engineering data behind this part.

ADAS, Radar, and Why Cap Geometry Matters

On ProPILOT Assist-equipped trims, the mirror housing is part of the sensing chain, not just trim. With 2026 CAN-bus 3.0 architecture integrating more mirror-mounted ADAS sensors, an intact, structurally sound cap protects blind-spot monitoring (BSM) and lane-departure warning (LDW) signal integrity.

The 3.2mm radar clearance envelope

The cap's internal rib geometry preserves the 3.2mm clearance envelope required by Nissan's blind-spot radar waveguide — a tolerance low-tier aftermarket caps often compromise.

The ASA/ABS polymer is also RF-transparent in the 24 GHz and 77 GHz bands used by the blind-spot detection system, with signal attenuation below 0.3 dB — inside the 1.0 dB maximum permissible loss in Nissan's ADAS calibration protocol.

Fault codes that trace back to cap damage

• B1150–B1199 — Body Control Module, Mirror Subsystem (heater circuit, fold actuator, electrochromic dimming)
• U0232 — Lost Communication with Blind Spot Detection Module
• C1A00–C1A99 — Chassis/ADAS blind-spot sensor plausibility errors

These codes frequently trace to impact damage that deforms the sensor bracket alignment. This cap's OE-spec dimensional fidelity is verified across 18 critical datums, preventing the misalignment that triggers cascading faults.

CAN-bus 3.0 readiness

CAN-FD body modules move mirror-position and heater-status telemetry at 5 Mbps, so connector contact must be pristine — inspect the mirror harness JST connector before final snap-in. A pinched connector, not RF obstruction, is the usual cause of a U0232 code after a cap swap.

Installation Notes: Clip-On, Plus One Electrical Check

Installation is a direct clip-on with the OEM retention-clip design — no adhesive, no tools. Clip-retention force is SPC-monitored at a 42N ±5N target under ISO 9001:2015-certified molding, so the cap snaps in solidly and stays put.

One electrical step matters: the cap includes a heater-wire pass-through channel. If your mirror glass is heated, seat the two-pin heater connector fully into the glass backing plate before reattaching the cap — a half-seated connector can set B1187 (Mirror Heater Output Circuit Open), flagged under 2026 OBD-II readiness monitor protocols.

If B1187 appears after the swap, measure heater element resistance: 4.2–5.8 Ω at 25°C is in spec. A reading in that range means the element is healthy and the fault sits in the connector, not the cap.

Related Parts Worth Checking on the Same Car

An impact hard enough to crack the mirror cap often leaves other wear behind. If the steering feels loose or the tires wear unevenly, the 4pc Steering Parts kit — 2 Wheel Hub and Bearings + 2 Outer Tie Rods Ends bundles the hub-bearing and outer tie-rod wear items into one order.

For exterior lighting upkeep, Koeep's complete guide to the Nissan Altima Fog Light Assembly 26155-6CA0A covers installation, benefits, and maintenance of the factory fog light unit.

For the next panel, cover, or trim piece, browse the full Body Parts collection of auto and motorcycle body components.

Mirror Cap FAQ: Fitment, Codes, and Color Match