HP Tuners MPVI4 Tuner - Open Box M04-00-000

This is a genuine HP Tuners MPVI4 (part number M04-00-000) sold as open box. It is the same current-generation OBDII tuning interface as our new unit, at $379.99 instead of $399.99.

Units are customer returns, display pieces or previously used interfaces. Every one is connected, updated and tested before it is relisted. You get the interface and all original components; the retail packaging may show wear or be missing.

Why buy it here

• $379.99 open-box price, authentic HP Tuners reseller
• Storewide coupons and cart discounts still apply, so the open-box price drops further at checkout
• Ships free from our Alabama warehouse; orders before 3 pm Central ship the same business day
• Expedited shipping upgrades available at checkout
• Support from people who tune with this tool

What open box means here

• Tested by us on a vehicle before it goes back on the shelf
• All original components included: MPVI4 interface, USB-C cable, lanyard, quick start guide and HP Tuners stickers
• Same HP Tuners manufacturer warranty as a new unit
• Previous registration removed and verified by us, so the unit is ready to add to your HP Tuners account, even if a prior owner's vehicle license is still on it
• Retail box may be scuffed, opened or absent

Everything else is identical to the new MPVI4

• Pro Feature Set included (standalone logging, PROLINK+ input)
• Dual-core 1.7 GHz processor, 1 GB RAM, USB-C, Bluetooth 5.2, Wi-Fi hardware (HP Tuners plans to enable it by firmware update in early 2027)
• Full VCM Suite support across 40+ manufacturers
• Full product details on the new MPVI4 listing

Before you buy

• Credits are not included. Writing a tune uses Universal Tuning Credits; most vehicles take 2 for the engine controller, and many 2021 and newer North American trucks and cars also need a separate transmission-controller license.
• Check your exact vehicle before ordering. Interface support, the credit count and any one-time ECM or PCM upgrade all depend on the application; the lookup tool on the credit page covers all three, and upgrade services are listed under HP Tuners ECM and PCM upgrade services.
• PROLINK+ cable not included.
• Limited quantity; when the open-box units are gone this listing shows sold out.

Specifications

• Part number: M04-00-000 (open box unit)
• Condition: open box, tested, complete
• Brand: HP Tuners
• Warranty: HP Tuners manufacturer warranty, same as new
• Country of origin: United States

Frequently asked questions

Why is it cheaper?

Because it is not a factory-sealed unit. Open-box units are customer returns, display pieces or previously used interfaces. Each one is tested by us before resale, and the hardware, firmware and warranty are the same as new. We would rather sell a tested unit at a discount than send it back to HP Tuners.

Could it have someone else's vehicle licenses on it?

It might. We remove and verify any previous registration before the unit ships, so the interface is ready to add to your own HP Tuners account. A license left by a previous owner is tied to that owner's vehicle: it does not give you a free license, and it does not stop you from licensing your own vehicle. You buy credits and license your vehicle the same way you would with a new unit.

Can I return it?

Open-box units are sold as tested and are exchange-only: if yours arrives faulty, we exchange it. Every unit is tested on a vehicle before it ships, so this is rare.

Is anything missing compared with a new one?

No hardware is missing: same interface, USB-C cable, lanyard, quick start guide and stickers, same firmware updates, same warranty. What differs is that the unit may have been opened, displayed or previously used, the retail packaging may show wear or be absent, and the price is $20 lower.

Do I need credits to use the MPVI4?

Not to read, log, diagnose or edit. You need Universal Credits only when you write a tune to a vehicle for the first time. After that the vehicle is licensed to the interface and you can rewrite it as often as you like at no further cost.

Watch: how to add credits to your MPVI4