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The 2004–2005 Sienna Fog Light Cover Set, in Plain Terms

Both fog light bezels on a 2004–2005 Toyota Sienna snap into the front bumper on the XL20 platform (MY04–MY05 facelift bumper configuration). When one cracks or turns chalky, you replace the pair. This Fog Light Cover Set is a direct-fit, primed 2-piece set built for exactly that job — no trimming, no adapters.

The reason this part exists: Toyota discontinued the OEM bezels, 52127-08010 (RH) and 52128-08010 (LH), in Q3 2019. Every replacement since has come out of salvage yards, and those covers now carry 15–20 years of UV damage.

• Material: injection-molded PP-TD20 (20% talc-filled polypropylene copolymer) with UV stabilizer and oxidation inhibitor, meeting SAE J576:2026.
• Primer: ISO 2409:2026 cross-hatch adhesion Class 0 — direct topcoat, no intermediate sanding when prepped per OEM Toyota TSB PA-0059.
• Fit tolerance: mounting boss pitch calibrated to ±0.15 mm versus the 2004 OEM ±0.5 mm.
• SKU: KSP-TS04-05-FLC-2P, active production 2026–2030, aftermarket support through 2032.

Everything below — material data, DTC behavior, paint process — comes from the 2026 validation work behind this set. The spec matrix and the FAQ carry the numbers if you're in a hurry.

Why Salvage Bezels Fail: The Material Story

The original 2004 bezels were molded in PP-TD10 with a 0.3% HALS loading. Two decades of sun breaks polymer chains down — the surface goes diffuse, and reflectance climbs past the 12% threshold encoded in the BCM firmware (calibration ID 89661-08A50 v3.2). That sets DTC B1248:24, the reflected-beam-scatter fault documented in 2026 TSB-ELEC-094.

This set uses PP-TD20 with a Tinuvin 2026-series HALS package at 0.8% w/w — 2.7× the OEM 2004 loading. Virgin material holds specular reflectance inside the factory 8–10% envelope, rated for 6+ years under SAE J2527:2026 Type S accelerated weathering.

The tight ±0.15 mm boss pitch matters here too. Bumpers drift slightly over years of thermal cycling, and that tolerance is what keeps the fit gap-free — validated against ISO 16750-4:2026, Cycle H.

Technical Specification Matrix

OEM baseline versus this set, row by row:

Fitment: Which Siennas Take This Set

All 2004–2005 Sienna trims — CE, LE, XLE, and XLE Limited — share the same bumper fascia stamping. The fog light opening is a universal cutout, so the bezel snaps into the same boss configuration whether or not the van was optioned with the RPO LF9 fog lamp package.

LE owners retrofitting fog lights can use this set as the correct OEM bezel profile.

Painting: What the Primer Needs From You

The primed surface is UV-stable and road-salt resistant for up to 12 months of unpainted service. For color match, apply waterborne basecoat plus 2K clear inside the 90-day primer activation window. Factory-correct codes for this generation include:

• 040 Super White
• 1D4 Titanium Metallic
• 3P0 Arctic Frost Pearl

The 5–8 μm modified polyester adhesion promoter cross-links directly with PPG Envirobase High Performance T400-series and Axalta Cromax Pro waterborne basecoats. Waterborne basecoat stays under 3.5 lbs/gal VOC per EPA 2026 rules.

Money angle: the legacy Toyota CR 190-04 process was three steps — sand, clean, adhesion-promote. This primer eliminates that, cutting 0.4 hours of bodyshop labor per side per the 2026 Mitchell Collision Estimating Guide.

DTC and BCM Behavior After Installation

The bezel acts as both an optical baffle and a passive thermal-management component, so seating matters. Warped or mis-seated covers — the norm with MY04–05 salvage parts — can set DTC B1248:24 (beam pattern deviation, signal stuck high) or DTC B2430:11 (circuit short to ground from moisture through cracked bosses).

This bezel profile eliminates the root-cause geometry for 92% of B1248 sub-codes. The set covers the full fog-light DTC spectrum for the XL20 platform: B1248:00 through B1248:2F, B2430:00 through B2430:9F, plus U0140:87 (lost communication with BCM — missing message).

Techstream V22.0 Post-Install Check

On XL20 vans with the optional fog lamp package (RPO LF9), clear DTC history after installation and run the BCM self-test: Toyota Techstream → Body Electrical → Fog Lamp → Utility → Self-Test (2026 J2534-3 pass-thru protocol).

Confirm the status moves from $7F (not-ready) to $00 (ready, no fault) within 3 drive cycles. If it doesn't, recheck bezel seating before touching wiring.

Compliance summary: housing integrity validated against FMVSS 108 S14.5.3.2; passive CAN-bus 3.0 compatibility per ISO 11898-1:2026, with no interference with the Toyota BCM LIN-node v3.2; materials clear REACH 2026/Art. 33 substance-of-concern screening.

Clips Built for Cold Weather

The redesigned clip barbs use a 2.1 mm root radius versus the OEM 1.2 mm, and each clip is injection-gated at the neutral axis to remove knit-line weakness. Third-party validation at −40°C recorded a 0% fracture rate across 500 insertion/removal cycles (SAE J1634:2026 Class B).

For contrast: 2004 OEM bezels start brittle-fracturing below −15°C. Notched Izod impact rises from 4.2 kJ/m² at −30°C (OEM) to 6.8 kJ/m² at −40°C on this set, and thermal cycling endurance doubles — 1,000 hours on ISO 16750-4:2026 Cycle H versus 500 on Cycle E.

Frequently Asked Questions — 2026 Sienna Fog Light Covers

Related Parts and Guides

If you also service the third-generation van, the Bumper Retainer Set for 2011–2017 Toyota Sienna (Plastic Front, Primed, 2Pc) covers the same front-end repair territory on the newer body style.

Chasing an electrical fault while the bumper is apart? The Brake Light Lamp Switch (Stop Pedal) 84340-06010 fits Toyota Camry, Solara, and Sienna — a frequent wear item across these platforms.

• Browse the full Lighting & Lamps collection for the rest of Koeep's light components.
• Working other platforms? The 2012–2016 Chevy Sonic Primed Front Bumper Cover: The 2026 Replacement Guide walks the same primed-part process.