KONNWEI MAXOBD Bluetooth OBD2 Diagnostic Tool (Android/iOS)

KONNWEI MAXOBD is a powerful Bluetooth OBD2 scanner that turns your mobile phone or tablet into a professional vehicle diagnostic tool. It is designed to perform full system diagnostics and can read/clear fault codes, display live data, read control module information, perform active tests (actuation tests), and use selected maintenance functions for systems such as ECM (engine), BCM (body control module), SRS (airbag), TCM (transmission), BMS (battery management system), TPMS (tire pressure monitoring system), SAS (steering angle sensor) and A/C (air conditioning) – depending on vehicle support.

With Auto-VIN, MAXOBD can automatically identify many car models and generate a Vehicle Health Report after diagnosis. The report can be shared, which is perfect for workshops, fleet managers, or those who want to save troubleshooting history. Live data is presented as a data stream and can be combined with graphs and data recording to find intermittent faults and analyze anomalous parameters over time.

Connection is made via Bluetooth 5.2 (up to approximately 10 m range in an open environment), and the user-friendly app offers clear graphs, multi-language support, and a DTC code library for better understanding of fault codes. It supports multiple OBDII protocols such as ISO 14230-4 (KWP2000), ISO 15765-4 (CAN), ISO 9141-2, ISO 14229 (UDS), and SAE J1850 (VPW/PWM). MAXOBD is suitable for both DIY enthusiasts and professional technicians and works with 120+ car brands (according to product information), typically for cars from 1996+.

• Full system scan: engine, transmission, ABS, SRS, BCM, etc. (depending on car)
• Active tests: control solenoids/actuators for faster troubleshooting
• Live data: sensors, RPM, fuel parameters, and 1000+ parameters (depending on car/app)
• Bluetooth 5.2: stable wireless connection (up to approx. 10 m)
• Auto-VIN: automatic identification of many car models
• Report: automatic health report that can be shared
• Updates: free updates anytime (according to product text)

Why MAXOBD?

Many inexpensive OBD2 dongles can read engine-related fault codes (ECM) – but when you need to go further than "the check engine light is on," they quickly become limited. KONNWEI MAXOBD is intended for those who want full system diagnostics in a convenient format: you use your own smartphone/tablet, get clear graphs, and can generate a report after diagnosis.

The main difference is the combination of: full system scanning (multiple control units), active tests (controlling components for verification), live data with graphs/logging, and a shareable health report. This saves time when troubleshooting and allows you to find the cause faster – not just "clear the code and hope."

For whom? MAXOBD is a good choice for both DIY enthusiasts and mechanics who want a powerful scanner without having to carry around a large handheld toolbox. It is also suitable for car fleets thanks to its reporting and logging functions.

Features & System Support

Full System Diagnostics

MAXOBD is stated to support diagnostics for many systems, such as: ECM, BCM, SRS, TCM, BMS, TPMS, SAS, A/C, and others (exact level depends on the car, model year, and equipment).

Read & Clear Fault Codes

• Read/Clear DTC: read and clear fault codes in supported control units.
• Freeze frame / status: at the OBD2 level, many cars can display freeze frames and status information (depending on the car/app).
• Module info: read information about control modules (ID, versions, etc., where supported).

Maintenance Functions

Maintenance functions can include various service and reset functions (vary greatly by car brand). This is useful for correctly completing service jobs – but always check the app for available functions for your specific car.

Auto-VIN

With Auto-VIN, MAXOBD can automatically identify many vehicles. This simplifies startup and reduces the risk of selecting the wrong model.

What are Active Tests (Actuation/Active Test)?

Active tests mean that the scanner can send commands to a system or component (solenoid, actuator, relay, valve, fan, pump, etc.) to test its function without you having to trigger it via the car's controls. It is one of the biggest time-savers in troubleshooting.

Examples of how active tests help

• Quick verification: “Does the component work when commanded?”
• Isolate faults: distinguish between electrical faults, mechanical faults, or control faults.
• Less guesswork: you sometimes avoid unnecessary disassembly.

Important: Active tests are vehicle-dependent. Some cars support many tests, others few. Always perform tests when the car is safely stationary, in the correct position (park/neutral), and follow the app's instructions.

Live Data: graphs & datalogging

MAXOBD can display live data stream and combine it with graphical display and data record. This is particularly useful when the fault only occurs intermittently, or when you want to compare several values simultaneously (e.g., temperatures, pressures, voltages, lambda values, RPM, etc. – depending on the car's available PIDs).

Why graphs are better than just numbers

• You see "spikes" and drops directly, without staring at a list of numbers.
• You can more easily detect trend faults (e.g., slow deviation over time).
• You can record and analyze afterwards, instead of trying to "catch" the fault in real time.

According to product information, MAXOBD can monitor 1000+ parameters (in practice, this depends on the car's ECU and which module you are reading).

Vehicle Health Report & Sharing

After diagnosis, a Full system Vehicle health report can be automatically generated. The report can be shared, which is perfect when you:

• want to send results to a customer, colleague, or workshop
• want to document status before/after repair
• want to save a history of recurring faults

For fleets and service jobs, this is often as valuable as the diagnosis itself – documentation saves time and reduces misunderstandings.

Compatibility: Cars, Protocols & Requirements

Cars & Model Year

According to product information, MAXOBD works with most car models after 1996 and over 120+ car brands. Note that OBD2 requirements differ between regions and fuel types (e.g., many EU cars became "fully" OBD2 standardized later than 1996). If you are unsure: check that the car has an OBD2 port (16-pin) and that your car is supported in the app.

Supported OBDII Protocols (according to product text)

• ISO 14230-4 (KWP2000)
• ISO 15765-4 (CAN)
• ISO 9141-2
• ISO 14229 (UDS)
• SAE J1850 (VPW & PWM)

Full System vs. Standard OBD2

Standard OBD2 primarily covers engine/emission-related data. Full system diagnostics (ABS, SRS, BCM, TCM, etc.) are often manufacturer-specific and depend on both the car and app support. MAXOBD is designed to provide broader coverage, but the exact scope always varies.

App & Connection (Android/iOS)

The KONNWEI MAXOBD Bluetooth OBD2 scanner turns your smart device into a diagnostic tool. It is compatible with Android and iOS. The app is designed to be user-friendly with clear graphs, multi-language support, and a DTC library to help you interpret fault codes.

Bluetooth 5.2

• Stable connection via Bluetooth 5.2
• Up to approximately 10 m range in an open environment (walls/interior can reduce range)
• Fast connection for daily troubleshooting

Step-by-Step: Installation & Usage

Preparation

• Ensure the car is safely parked (P/N), with the parking brake engaged.
• Have your phone/tablet charged and Bluetooth turned on.
• If you are performing active tests: always read the instructions in the app before starting the test.

1) Connect MAXOBD to the OBD2 port

1. Locate the car's OBD2 port (usually under the dashboard).
2. Plug in MAXOBD securely.
3. Turn the ignition to ON or start the car according to the app's instructions.

2) Install and open the app

1. Install the MAXOBD app (according to the product's instructions/QR/name provided).
2. Grant the app necessary permissions (Bluetooth, possibly location on Android if required for BLE).
3. Open the app and select "connect."

3) Pair via Bluetooth 5.2

1. Select the MAXOBD device in the app.
2. Wait for the app to confirm connection.
3. If you encounter problems: close the app completely and try again (also see Troubleshooting).

4) Auto-VIN and vehicle selection

1. Run Auto-VIN for automatic identification (if supported).
2. If Auto-VIN does not find the car: select make/model manually.

5) Run Full System Scan

1. Select Full System Scanning.
2. Allow the scanner to go through the modules (ECM/ABS/SRS/BCM/TCM, etc., depending on the car).
3. Save the result and create a Vehicle Health Report afterwards.

6) Read and clear fault codes

1. Open a module (e.g., ECM or ABS).
2. Press Read Codes and read both current and stored codes (if the app displays this).
3. Document the codes and address the root cause before pressing Clear Codes.

7) Live Data + graph + recording

1. Go to Live Data in the relevant module.
2. Select the parameters you want to monitor (e.g., RPM, voltage, temperatures, pressures).
3. Activate Graphing and/or Data Record for logging.
4. Analyze and compare when the fault occurs.

8) Active tests (Actuation)

1. Open the module where the active test is available.
2. Select Active Test / Actuation Test.
3. Follow the instructions carefully and only perform tests when it is safe.
4. Note results: does the component react? Is it audible? Do values in live data change?

9) Share report

1. Create a Vehicle Health Report.
2. Share the report via the app's sharing function (e.g., email/message – depending on the phone).
3. Save the report as "before/after" when you have made repairs.

Troubleshooting: Common Issues

Problem: The app cannot find the scanner

• Check that MAXOBD is properly seated in the OBD2 port.
• Turn the ignition ON – many OBD2 ports are de-energized when the car is completely off.
• Close the app completely and reopen it.
• Turn Bluetooth off/on.
• On Android: check that necessary permissions are granted.

Problem: I can read the engine but not ABS/SRS

• Full system functionality commonly varies between car brands, models, and model years.
• Update the app/firmware if updates are available.
• Try manual vehicle selection if Auto-VIN did not select correctly.

Problem: Live data updates slowly

• Select fewer parameters at a time (fewer PIDs can provide faster updates).
• Ensure a stable Bluetooth connection and that the phone is not throttled by power-saving mode.

Tips for Best Results

• Always document fault codes before clearing them.
• Combine live data + graph to find intermittent faults.
• Create a health report before and after repair – perfect as proof of action.
• Perform active tests methodically: change one thing at a time and note the result.
• If working on a customer car: share the report for clarity and transparency.

Want more OBD2 options? See also our categories: Bluetooth fault code readers and diagnostic tools.

Specifications

Package Contents

• 1 × KONNWEI MAXOBD Bluetooth OBD2 Scanner
• Getting Started Guide (app/QR/activation may vary between batches)

Note: Package contents may vary depending on the supplier version. Check product images/specs from the current delivery if needed.

FAQ – Frequently Asked Questions about KONNWEI MAXOBD

1) Does MAXOBD work with iPhone (iOS)?

Yes, it is compatible with both Android and iOS according to the product information.

2) Does it work with Android?

Yes, MAXOBD works with Android and connects wirelessly via Bluetooth 5.2.

3) Can it read ABS and Airbag (SRS)?

It is stated to support full system diagnostics including ABS/SRS, but exact coverage varies between car brands, models, and model years.

4) Can it read transmission (TCM)?

Yes, TCM is mentioned in the system list. Whether it works on your car depends on the car's support and how the module is exposed in the app.

5) Is this the same as a cheap ELM327 dongle?

MAXOBD is positioned as a more comprehensive scanner with full system, active tests, and reports compared to many simpler OBD2 dongles that often only focus on the engine.

6) What does "Full System Scanning" mean?

That the scanner can scan multiple control units (ECM/BCM/SRS/ABS/TCM, etc.) and create a comprehensive picture of the car's fault codes and status.

7) What are active tests?

Active tests (actuation) mean that the scanner can send commands to components to test their function without using the car's controls.

8) Can I see live data in real-time?

Yes, MAXOBD supports Live Data Stream and displays data in the app, including graphical display and logging.

9) What is the "Vehicle Health Report"?

An automatic diagnostic report after scanning that can be shared and saved for documentation.

10) Can I share the report with a workshop?

Yes, the report can be shared via the app's sharing function (depending on the phone's capabilities).

11) Does it support Auto-VIN?

Yes, Auto-VIN is available and can identify many car models automatically.

12) Does it work on all cars from 1996 and newer?

It is stated to work with most cars after 1996 and 120+ car brands, but OBD2 standardization varies between regions. Check support in the app.

13) Which OBD2 protocols are supported?

ISO 14230-4 (KWP2000), ISO 15765-4 (CAN), ISO 9141-2, ISO 14229 (UDS), SAE J1850 (VPW/PWM).

14) Do I need internet to use it?

Basic diagnosis usually works without constant internet, but updates and some libraries/reports may require internet depending on the app.

15) Are updates free?

Yes, according to the product description, it offers free update anytime.

16) Can it program ECU or change maps?

The product is described as a diagnostic tool with active tests and maintenance functions. It is not described as an ECU remap/programming tool.

17) Can I clear fault codes?

Yes, it can read and clear fault codes in supported systems.

18) Is it safe to clear fault codes?

Only clear codes once you have documented them and fixed the fault. Simply clearing them can make troubleshooting more difficult if the fault recurs.

19) Can it help with intermittent faults?

Yes, through live data + graph + data logging, you can more easily detect intermittent deviations.

20) What is the Bluetooth range?

Bluetooth 5.2 is specified with a range of up to approx. 10 m in open environments. In practice, the car's bodywork and obstacles affect this.

21) Do I need a computer?

No, the tool is designed to work with a mobile/tablet (Android/iOS).

22) Can it be used by beginners?

Yes, the app is described as user-friendly with clear graphs, language support, and code libraries.

23) Does it work on diesel cars?

OBD2 support for diesel varies with model year/region, but many diesel cars are supported. Check the OBD2 port and support in the app.

24) Can I read TPMS (tire pressure monitoring system)?

TPMS is mentioned as system support, but the exact function varies between cars and may require car-specific support.

25) Can I read the battery system (BMS)?

BMS is mentioned in the list. The exact level depends on the car's system and how data is exposed in the app.

Notices & Disclaimer

• System support varies: Full system diagnosis and active tests depend on the car make/model/year and equipment level.
• Drive safely: Do not use diagnostic functions while driving. Park in a safe location.
• Do not clear randomly: Save fault codes and freeze frame before clearing. Address the root cause first.
• Active tests: May affect components. Follow instructions and only perform tests when the car is safely parked.
• Compatibility: OBD2 primarily applies to engine/emissions. Manufacturer-specific systems may require special support.

E-E-A-T: This guide has been developed to be practical, clear, and based on the product's specified functions and common workshop practices.
Last updated: 2026-02-14

Summary

KONNWEI MAXOBD is a smart choice when you want full system scanning, active tests, and live data with graphs in a mobile-based solution. With Bluetooth 5.2, Auto-VIN, and shareable reports, troubleshooting becomes faster and documentation better – whether you are a DIY enthusiast or a professional.

Do you want to complement with more accessories? See our categories: OBD2 accessories and diagnostic tools.