VIOFO A139 Pro 2CH: problems, parts and running costs

Checked: 2026-10-20

Summary

The A139 Pro 2CH records sharp 4K HDR footage from the front but only 1080p from the rear, so the two things to plan around are weak night plate capture on the rear camera and a storage burn of more than 300MB per minute for both channels together. There is no recurring consumable after the initial setup: the camera runs on a super capacitor instead of a battery, and the extras you need once are a 256GB card, a hardwire kit and a fuse tap, roughly $60 to $70 on top of the camera.

Common problems and fixes

Storage fills faster than most cards — front and rear together wrote more than 300MB for every minute of recording in the same test, so a 64GB card filled and overwrote the oldest footage after less than four hours of driving. The fix is a card of at least 256GB, which covers a long round journey of around 14 hours, and card capacity is not a warranty item. [2]
The rear camera ships without a polarizing filter — the box contains a CPL-200 for the front lens only, and the reviewer noted the rear footage would have benefited from one. VIOFO sells the CPL-300 rear filter at $12.99; it is an accessory, so it falls under the 12-month accessory warranty if it arrives faulty. [1][2]
The microphone picks up quiet indicator ticks — the camera was unaffected by music or children talking but, in a stationary car, it “seemed to hate the ticking of the indicator”. The workaround the tester used was low radio volume and white noise, and the problem disappeared once driving. [2]
Start-up and shut-down sounds are harsh — the same test described them as “incredibly harsh”; they are a settings toggle in the app, so turning them off is the fix. [2]
Parking mode needs a hardwire kit and a fuse tap — the super capacitor design leaves no battery to run parking mode, so the camera must be hardwired; VIOFO’s HK3-C Type-C kit is sold without a fuse tap, and one tester could not complete the install because his fusebox was too small for his hands. A parking-mode problem is usually an install problem rather than a camera fault, and a hardwired camera that will not start is a fitting question first and a warranty claim second. [1][3]
No driver aids, no SOS function, no voice control — the camera has no advanced driver assistance and no emergency SOS feature, and voice control is not supported although voice notifications are. There is no workaround beyond a different camera if those features matter to you. [2][1]

Parts and consumables

Industrial-grade U3 A2 V30 microSD card, 64GB to 512GB — $39.99 for the 64GB to 512GB range at VIOFO, October 2026. The card is not included with the camera. No card life or failure rate is published for this model, so the replacement interval is worked out from capacity instead: at more than 300MB per minute for front and rear, a 64GB card gives under four hours of recording and a 256GB card around 14 hours, which makes 256GB the sensible minimum. [1][2]
HK3-C Type-C hardwire kit — $17.99 at VIOFO, October 2026. Needed for parking mode because the camera has a super capacitor rather than a battery, and the kit does not include a fuse tap. [1]
8-piece multi-size circuit fuse tap kit — $15.99 at VIOFO, October 2026, sold separately from the hardwire kit. [1]
CPL-300 rear polarizing filter — $12.99 at VIOFO, October 2026. The front CPL-200 filter is already in the box. [1]
A139-series anti-tamper screw mounting bracket — $10.00 at VIOFO, October 2026. [1]
BTR200 Bluetooth remote — $19.99 at VIOFO, October 2026. The camera has built-in Bluetooth with a stated 5m control distance, used to start recordings by hand. [1]

Yearly running cost

There is no recurring consumable to buy: the camera has a super capacitor instead of a battery, so there are no cells to replace, and the rear filter and the mounting hardware only need replacing if they are damaged. The spend is a one-off setup cost. VIOFO’s own store listed an industrial-grade U3 A2 V30 card in 64GB to 512GB at $39.99, the HK3-C hardwire kit at $17.99 and the separate 8-piece fuse tap kit at $15.99 in October 2026, which puts a 256GB-class card plus hardwire kit plus fuse tap at roughly $60 to $70 on top of the camera price. After that the only part that wears out is the card, and no card life, failure-rate or service-life figures are published for this model, so a yearly card replacement cannot be priced from the available evidence. Electricity is quoted only as a DC 5V / 2A input with no consumption figure given, which means the running cost of this camera is storage hardware rather than power. [1][2]

When it is a good buy

VIOFO’s own US store listed the 2CH bundle at $249.99 against a $329.99 regular price in October 2026, and the price points recorded by Trusted Reviews were a UK RRP of £237 and a CA RRP of CA$440 in 2023. US retailer street prices for this bundle could not be obtained, so the store price to judge against is the manufacturer’s own. At around $249.99 it is a good buy if you want strong 4K front plate capture together with GPS, dual-band Wi-Fi and buffered parking mode in one box, with no separate GPS module and no screen, and you will fit a card and a hardwire kit once rather than repeatedly.

VIOFO A139 (non-Pro) — the standard A139 records 2K at the front instead of 4K. It is the better choice when 4K plate detail is not the deciding factor and the budget is tighter. [2]
VIOFO A139 Pro 3CH bundle — adds a 1080p interior camera to the same 4K front unit, and the family can also be built with either a 1080p interior or a 1080p rear camera. It is the better choice when cabin coverage matters more than a tidy windscreen, but with all three channels running the front drops to 24fps or 3840x1600, the interior camera’s 1m cable will not reach the back of a car, and Trusted Reviews noted the missing camera could be added for about £55 instead of buying the bundle outright. [5][3][2]