- iPhone support is the #1 pre-sale question: offer WiFi or Bluetooth 5.x models for iOS customers.
- Chip quality matters more than the label — test samples on real vehicles before ordering in bulk.
- 9–30V DC24K adapters cover 12V cars and 24V vehicles; physical power switches prevent battery-drain complaints.
- A simple four-tier line-up (entry dongle, mid-range adapter, handheld reader, AFM disabler) covers most buyers.
OBD2 scanners are one of the most stable categories in automotive electronics: every car sold in the US since 1996 has an OBD-II port, and drivers want to know why the check-engine light is on. But the range of models is confusing. This guide explains the main types so you can build a product line that sells and avoids returns — whether you sell on Amazon, TikTok Shop, your own website or to auto-parts stores.
OBD-II basics every seller should know
OBD-II (On-Board Diagnostics II) is the standard diagnostic port and protocol set used in modern cars. It became mandatory on cars sold in the US from 1996, followed by the European EOBD standard in the early 2000s and similar standards in Asia. Through this 16-pin port, a scanner can read fault codes (DTCs), clear the check-engine light and show live engine data.
Different car makers use different communication protocols. A good adapter supports all of them automatically:
| Protocol | Typically found on |
|---|---|
| ISO 15765-4 CAN | Most cars from around 2008 onward |
| SAE J1850 VPW | Older GM vehicles |
| SAE J1850 PWM | Older Ford vehicles |
| ISO 9141-2 / ISO 14230-4 KWP | Older European and Asian vehicles |
| SAE J1939 | Heavy-duty and 24V commercial vehicles |
1. Bluetooth or WiFi?
Bluetooth adapters are the most popular choice for Android users. They pair once and reconnect automatically. However, iPhones cannot use older adapters that only support classic Bluetooth — for iOS customers you need a model with WiFi or with Bluetooth Low Energy (BLE), such as newer Bluetooth 5.x adapters.
WiFi adapters work with both iOS and Android apps. The trade-off is that the phone connects to the adapter's WiFi network, so mobile internet may be interrupted while scanning on some phones.
Tip: list the supported phone systems clearly on every listing. "Does it work with iPhone?" is the number-one pre-sale question and the most common reason for returns.
2. Chip and firmware: why "V1.5" matters
Most budget adapters are based on the ELM327 command set. In the market, adapters labelled V1.5 are usually preferred over many cheap "V2.1" clones because they tend to support the full set of older protocols, which matters for older vehicles. Higher-end adapters use a dedicated microcontroller such as the PIC18F25K80 (often shortened to "25K80"), which gives more stable connections and better app compatibility.
3. Voltage range: 12V only, or 12V and 24V?
Classic ELM327 dongles are designed for 12V passenger cars (9–18V input). The new DC24K series accepts 9–30V, so the same adapter works on 12V cars and on 24V vehicles and some diesels — useful if your customers include light-truck and fleet owners.
4. Battery protection
Many drivers leave their adapter plugged in permanently. Cheap dongles can slowly drain the battery. DC24K models use a high-efficiency DC-DC power supply and a physical power switch, so customers do not need to unplug the adapter after every drive.
5. App-based adapter or handheld code reader?
| App-based adapter | Handheld code reader | |
|---|---|---|
| Screen | Uses the phone | Built-in display |
| Best for | Tech-savvy drivers, live data, HUD and trip logging | Older drivers, workshops, gifts — no app needed |
| Our models | KS-8801 to KS-8806, DC24K series | V410 (KS-8807), MS309 (KS-8808) |
6. Certificates and compliance
Marketplaces and importers increasingly ask for documents. Before you order, confirm the supplier can provide:
- FCC for wireless products sold in the United States.
- CE for the European Union and UKCA for the United Kingdom.
- RoHS for restricted hazardous substances.
- Test reports matching the exact model you are buying.
7. How to test samples before a bulk order
- Test on several vehicles — at least one older car (pre-2008) and one modern CAN vehicle.
- Test the apps your customers use — Torque, Car Scanner ELM OBD2 and similar — on both Android and iPhone where supported.
- Check connection stability over a 15–20 minute drive with live data running.
- Measure standby behavior — confirm the power switch or sleep function works.
- Inspect the packaging — box, manual and labels are what your customer sees first.
A simple starter line-up
- Entry price point: Mini ELM327 Bluetooth (KS-8801) and Mini WiFi (KS-8804).
- Mid-range best-seller: DC24K Bluetooth 5.4 (KS-8809) or FZ-DC24K (KS-8811).
- No-phone option: V410 handheld with large screen (KS-8807).
- High-margin hero: the AFM/DFM Disabler for GM V6 / V8 owners.
Listing tips that reduce returns
- State clearly which phones and operating systems are supported.
- Recommend specific free apps and include a quick-start card in the box.
- Explain that OBD2 scanners read standard engine codes; advanced functions vary by vehicle and app.
- Use real photos of the product plugged into a car — they convert better than renders alone.
All models can be supplied in neutral packaging or with your logo, color and box from 1,000 pcs. Browse the full OBD2 catalog or request a quote.
Frequently asked questions
Which OBD2 scanner works with iPhone?
Choose a WiFi adapter or a Bluetooth 5.x / BLE model. Older adapters that only support classic Bluetooth work with Android and Windows but not with iPhone.
What is the difference between ELM327 V1.5 and V2.1?
In the aftermarket, adapters labelled V1.5 usually support the full set of older protocols, while many cheap V2.1 clones drop some of them. Always test samples on the vehicles your customers drive.
Can an OBD2 adapter stay plugged in all the time?
Only if it has low standby consumption or a power switch. DC24K models include a physical switch and a high-efficiency power supply to protect the battery.
What is the MOQ for custom-branded OBD2 scanners?
Custom logo, color and packaging start from 1,000 pcs per model. Neutral samples are available first for testing.
Factory-direct pricing, samples and private label from 1,000 pcs.
