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Auxbeam B21 Series 4257 Switchback LED Bulbs Built in Resistor Error Free
✅ In stock
F
Grade
Price verified Sep 21, 2026 11:04 PM · Prices & availability subject to change
Is This a Good Price on Amazon?
💤 Not a Deal- 💤Verdict: Not a Deal. Price is at or above historical norms. Best to wait for a sale.
- ➡️Pricing has held fairly steady, with no strong push in either direction.
How We Scored This Deal
Price Competitiveness
0/28
Recent Value
0/22
Market Standing
0/20
Deal Strength
0/20
Momentum
0/10
📝 Product Overview
🏪 Sold by
AUXPOWER
📦 Fulfillment
Fulfilled by Amazon
🚚 Shipping
Free Shipping
Product Details
✓Specific for Ford Vehicle: Directly fit for 2022-2025 ford maverick front turn signal light, 2018-2020 f150 rear turn signal light, 2021-2022 f150 front/rear turn signal light, 2020-2022 f250/f350/f450/f550 super duty rear turn signal light and 2023 f-350 front turn signal light. Fit socket 4257 4257NA 4257NALL 4257NAK 4257A 4257AK, etc.
✓CANBUS ERROR FREE: Super compatible for 99% Vehicles. No hyper flash, no errors, no warning. With built-in CANBUS system, these 4257 dual color bulbs can directly alleviate decoding problems without trouble to prepare external resistors. Auxbeam offers 1-year warranty
✓600% EXTREMELY BRIGHT: Sequencing 36Pcs Upgraded high brightness 3030SMD chips precisely around each 4257 led bulb, 28W per bulb, High Power and 600% brighter, providing 6500K Cool White light or 3500K Amber Yellow light. Instant-on response without warm-up time. More noticable when turning, guard your driving safety
✓DUAL COLOR FUNCTION: This 4257 switchback led bulb with resistor lights up cool white for parking lights or daytime running lights (DRL) but amber yellow for turn signal lights. Unlike most turn signals flashing "amber-white-amber-white" on the market, the Auxbeam 4257 turn signals flash "amber-off-amber-off", making it easier to see from a distance.
✓COOLING SYSTEM REALLY MATTERS: IP68 waterproof. The built-in stable current IC driver avoids digital or VHF radio signal interference. The latest 4-layer cooling system - 12,000RPM silent fan + Copper cooling ring + 16Pcs heat sinks + 6063 aviation aluminum lamp body directly doubles heat dissipation, ensuring longer lifespan up to 60,000 hours.
⚙️ Specifications
Brand
Auxbeam
Light Source Type
LED
Item Package Quantity
1
Fit Type
Universal Fit
Auto Part Position
Front
Automotive Fit Type
Universal Fit
