KONNWEI KW905 – Wireless Bluetooth OBD2/EOBD/CAN Code Reader (iOS & Android)

Introduction

The KW905 is a wireless engine/emission scanner that uses the OBD2 standard to read and visualize data from the car's engine control unit (ECU). With the right app, you can view real-time data, retrieve and clear DTCs (fault codes), review freeze frame and I/M readiness, and perform tests such as O2 sensor, on-board monitor, and EVAP, where supported by the vehicle. The device has a power switch (ON/OFF) allowing you to leave it plugged in without disconnecting it between drives.

The casing is low-profile to avoid interfering with leg/knee room. Certifications: CE, FCC, RoHS, BQB. Color options: red/black, orange/black, black (may vary by batch). Language support depends on the chosen app – most offer multilingual interfaces.

Specifications

• Product Type: Wireless Engine Code Reader (Bluetooth OBD2 Dongle)
• Model: KONNWEI KW905
• Voltage: 12V (via OBD2 port)
• Power: Low power, sleep mode (typically <1W)
• Connectivity: Bluetooth 5.0 (or 4.0/BLE, depending on variant)
• Interface: 16-pin OBD2 (DLC)
• Dimensions (approx): 5 × 4 × 2.5 cm
• Power Switch: Yes, physical ON/OFF button
• Certificates: CE, FCC, RoHS, BQB
• App Platform: iOS & Android (mobile/tablet)
• Languages (e.g., via apps): English, Spanish, Portuguese, French, Russian, German, Italian, Polish, Turkish, Korean, Japanese, Arabic, Czech, Swedish, etc.
• Recommended app: Car Scanner ELM OBD2 (supports iOS/Android). Also compatible with, for example, Torque, DashCommand, Auto Doctor (app support varies).
• Color: red/black, orange/black, or black (may vary)

Features & Sensor Data

• Fault Codes: Read/clear DTCs (P0xxx/P1xxx). Built-in DTC libraries in apps explain the codes.
• Live Data: RPM, speed, engine temp (ECT), intake air temp (IAT), intake manifold pressure (MAP), mass air flow (MAF), lambda/O2, fuel pressure, ignition timing, throttle position, calculated engine load, etc.
• Freeze Frame: "Snapshot" of sensors when a fault code was set.
• I/M Readiness: Monitor status for inspection (emission).
• O2 Sensor Test: Displays the ECU's latest test results (not supported by all cars).
• On-board Monitor: Shows results of diagnostic tests (Mode $06).
• EVAP/Component Tests: Where the vehicle allows via the OBD standard.
• Data Logging & Export: Record driving data, export as a report (app-dependent).
• Acceleration & Statistics: 0-100, fuel consumption* and summaries (app-dependent).

* Fuel consumption is calculated; accuracy varies between vehicles and sensors.

Supported OBD Protocols

• ISO 15765-4 CAN
• ISO 9141-2
• ISO 14230-4 KWP2000
• SAE J1850 VPW
• SAE J1850 PWM

The device auto-detects protocols and switches to the correct communication where the car supports it.

Compatibility & Limitations

Designed for 12V OBD2/EOBD-compatible vehicles (passenger cars/light vehicles) with a 16-pin OBD port:

• USA: 1996+
• EU: Petrol ≈2001+, Diesel ≈2004+
• Canada: ≈1998+
• China: ≈2011+

Note: OBD2 primarily covers engine & emissions. Access to other systems (ABS/SRS/BCM/EPB/TPMS/BMS, etc.) requires app support and that the vehicle exposes it via OBD – this varies greatly between brands/model years. The KW905 is not intended for 24V truck/J1939.

Manual & Installation Guide (iOS/Android)

Preparation

1. Download a compatible app (recommended: Car Scanner ELM OBD2 for iOS/Android).
2. Locate the car's OBD2 port (usually under the dashboard near the driver's seat).
3. Ensure stable battery voltage (low voltage can result in "No Comm").

Mounting & Pairing

1. Turn off the ignition. Insert the KW905 into the 16-pin OBD2 port and press the ON button.
2. Turn the ignition to ON (engine off) so that the ECUs are active.
3. iOS (BLE): Open the app – select adapter in the app (BLE pairing happens in-app). Allow necessary permissions.
4. Android: Pair via the system's Bluetooth (if the app doesn't handle it) → open the app → select KW905 as the adapter.
5. Select car profile/Auto-VIN (if the car supports it) or enter make/model manually. Start diagnosis.

Quick Troubleshooting

1. Run Scan to read DTCs. Note codes and descriptions.
2. Review Freeze Frame and I/M Readiness for inspection.
3. Analyze Live Data (select few, relevant PIDs for fast updates).
4. Clear codes only after the root cause has been addressed.

After Use

• Close the app and switch OFF the KW905 if leaving it plugged in, to minimize battery drain.

Apps & Use Cases

• Car Scanner ELM OBD2 (recommended): Live data with graphs, reports, DTC lookup, I/M, customizable dashboards.
• Torque (Android): Dashboards, logging, plugins.
• DashCommand: Advanced gauges, fuel economy calculations.
• OBD Auto Doctor / Auto Doctor: Clear fault code reading and reports.
• BimmerCode etc.: Some brand-specific apps work with ELM/BLE – check each app's compatibility.

Note: Functionality and license cost are determined by the respective app developers.

Frequently Asked Questions (FAQ)

1. Does the KW905 read ABS/airbag/BCM?

The OBD2 standard focuses on engine/emissions. Some brand/module access may be available via apps, but is not guaranteed for all cars.

2. Does it work on electric vehicles?

Yes, for OBD2-exposed parameters. In-depth HV/BMS data often requires brand-specific or special apps – coverage varies.

3. Does it draw power if left plugged in?

Consumption is low and the device has sleep + ON/OFF switch. Turn off during longer periods of inactivity.

4. Support for 24V/trucks?

No. Only 12V passenger cars/light vehicles. For 24V/J1939, special equipment/adapters are required.

5. Why isn't the app connecting?

Ensure the ignition is ON, that you have selected the correct adapter/profile in the app, and that Bluetooth/permissions are active.

6. Can I reduce fuel consumption with KW905?

The device itself does not affect consumption, but live data and fuel reports can help you optimize driving style and maintenance.

Tips & Best Practices

• Log before clearing: Save DTC + freeze frame for better traceability.
• Fewer PIDs = faster graphs: Select 6–10 key values for high refresh rates.
• Stable voltage: Low battery voltage is a common cause of communication errors.
• App updates: Keep the app updated for new cars/protocols and bug fixes.
• Need a standalone scanner? See our handheld code readers.

Package Contents

• 1 × KONNWEI KW905 Bluetooth OBD2 Dongle
• 1 × Quick Guide (may vary by batch)

Note – Software Not Included

The product is sold without software. You use any compatible app (e.g., Car Scanner ELM OBD2, Torque, DashCommand, Auto Doctor, etc.). Need help getting started? Contact us and we'll send driver information/demo guide via email.

Important Notices & Responsibility

• OBD2 primarily covers engine & emissions; other systems require app/vehicle support.
• The user is responsible for app selection, licenses, and correct data interpretation.
• Never use a mobile phone/tablet while driving. Safety first.
• Not for 24V/J1939 environments. Damage due to incorrect voltage is not covered.

Summary

The KONNWEI KW905 provides you with affordable and convenient OBD2 diagnostics via your mobile phone: Bluetooth 5.0/4.0, live data, fault codes, I/M readiness, O2 tests, logging, and more – in a small enclosure with an on/off switch. Perfect for everyday diagnostics, troubleshooting, and optimizing driving and maintenance. 🔧