Purpose-built OBD-II diagnostic module with J2534-compliant interface, multi-protocol support (CAN, CAN FD, J1850, ISO 9141, K-Line, DoIP), integrated precision ADC for voltage measurement, Wi-Fi + BLE connectivity. Works with the CheckEngineHelp app for guided diagnostics, wire routing visualization, troubleshooting flowcharts, and live data.
CEH Scanner V1
Firmware 1.0.0
| MCU | ESP32-S3 (dual-core 240MHz, Wi-Fi + BLE 5.0) |
| SRAM / Flash | 520 KB SRAM, 4 MB on-board QSPI flash |
| Wi-Fi | 802.11 b/g/n 2.4 GHz (CYW43439 radio) |
| Bluetooth | BLE 5.2 (CYW43439) |
| USB | USB-C (J2534 pass-through + battery charging) |
| Co-processors | 8× PIO state machines, DMA, Arm TrustZone |
| Storage | microSD slot (up to 32 GB) for data logging, configs, firmware |
| CAN Bus | ISO 11898 — 250/500 kbps, dual-channel (MCP2515 + MCP2551) |
| CAN FD | ISO 11898-1:2015 — data phase up to 5 Mbps |
| J1850 VPW | SAE J1850 — GM vehicles (10.4 kbps) |
| J1850 PWM | SAE J1850 — Ford vehicles (41.6 kbps) |
| ISO 9141-2 | K-Line — European/Asian vehicles (10.4 kbps) |
| ISO 14230 | KWP2000 — Enhanced K-Line diagnostics |
| LIN Bus | ISO 17987 — Body electronics, seat motors, mirrors |
| ADC | ADS1115 — 16-bit, 4-channel |
| Voltage Range | 0–65V (via voltage divider) |
| Sample Rate | 860 SPS max |
| Accuracy | ±0.01% FSR |
| Battery Monitor | Real-time vehicle voltage tracking |
| External Sensors | Aux input header for wideband O2, EGT, boost pressure |
| Connector | Standard OBD-II (SAE J1962) male |
| Enclosure | ABS plastic, 85×55×25mm |
| Battery | LiFePO4 18650 — 3.2 V / 1800 mAh (5.76 Wh), 2000+ cycles |
| Charging | TP4056 USB-C module — 5 V / 1 A, auto-switches OBD→USB→battery |
| Power Sources | ① OBD-II 12 V ② USB-C 5 V ③ On-board battery |
| microSD | Push-push microSD slot, FAT32, up to 32 GB |
| Protection | Reverse polarity, 42 V transient, ESD 15 kV |
| Operating Temp | -20°C to +65°C (battery) / -40°C to +85°C (MCU) |
| LEDs | 4× status (power, vehicle link, data activity, battery) |
Professional-grade features that typically require multiple separate devices, built into one. No separate gauge, no external display, no adapter cables.
Stream live data as configurable gauges on your phone or tablet. Assign any PID to any gauge slot. Radial, bar, digital, or graph layout. Up to 8 simultaneous gauges updating at 10 Hz.
| Gauge Types | Radial sweep, linear bar, digital readout, time-series graph |
| PID Assignment | Drag-and-drop any OBD-II or manufacturer PID to any gauge slot |
| Refresh Rate | Up to 10 Hz per gauge (CAN bus), 2 Hz (legacy protocols) |
| Layouts | Save custom dashboard layouts, switch between presets |
| Alerts | Configurable high/low thresholds with audible + visual warnings |
Standalone OBD-II gauge displays typically cost $300–$600 and support a limited number of PIDs. The CEH Scanner turns your existing phone into a full gauge cluster with unlimited PIDs.
Built-in accelerometer-free performance measurement using GPS + OBD-II speed data. Quarter-mile timer, 0-60 mph, 60-130 mph, and custom interval runs with weather-corrected results.
| 1/4 Mile Timer | ET + trap speed, reaction time, 60-ft time |
| 0-60 mph | GPS-corrected with rollout compensation |
| Custom Intervals | Any speed-to-speed run (e.g., 30-50, 60-130) |
| Data Overlay | RPM, boost, AFR, and throttle position during the run |
| History | Save and compare runs with timestamps, weather, DA correction |
No extra hardware needed, no phone mount accelerometers to calibrate. OBD-II vehicle speed + phone GPS = accurate, repeatable results.
Record any combination of PIDs at up to 50 Hz to the on-board microSD card or stream directly to the companion app. Export as CSV, JSON, or share sessions to the cloud.
| On-Device Storage | microSD (up to 32 GB) with timestamped session files |
| Wireless Stream | Real-time data stream to companion app over Wi-Fi/BLE |
| Export Formats | CSV (spreadsheet), JSON (API), MegaLogViewer compatible |
| Auto-Log Mode | Start recording automatically when RPM > 0 (configurable) |
| Session Review | Playback logged data with synchronized multi-gauge display |
Professional standalone data loggers require a laptop tethered via USB and can cost $500+. The CEH Scanner does the same multi-channel logging wirelessly to your phone, with AI-enhanced analysis. No laptop in the passenger seat required.
Beyond generic OBD-II Mode 01 PIDs, the CEH Scanner includes manufacturer-specific PID databases for deep vehicle access. Updated with every firmware release.
| Ford Gas (2008+) | Cylinder contribution, misfire count, VCT position, turbo boost target vs. actual |
| Ford Diesel | Injection timing, rail pressure, DPF soot load, regen status, DEF level |
| GM All | TPMS sensor PSI, transmission temps by clutch, AFM status, flex fuel % |
| Universal OBD-II | Full SAE J1979 Mode 01–09, enhanced freeze frames, pending/permanent codes |
| Community PIDs | User-submitted PID definitions with validation, shared via cloud |
Professional OBD-II tools maintain manufacturer-specific PID packs that require manual SD card updates. The CEH Scanner includes the same depth of coverage, but PIDs update over Wi-Fi with every firmware release automatically.
The CEH Scanner exposes an auxiliary analog input header for aftermarket sensors. Connect a wideband O2, EGT probe, or boost sensor and overlay the data on the same gauge dashboard as your OBD-II PIDs.
| Wideband AFR | 0–5V input from AEM UEGO, Innovate, or Zeitronix controllers |
| EGT (Exhaust Gas) | K-type thermocouple via DPT EGT amplifier (0–1800°F) |
| Boost/Vacuum | 0–5V MAP sensor input (up to 60 PSI) |
| Custom 0-5V | Any sensor with a 0–5V analog output via the ADS1115 spare channels |
External sensor inputs are standard on high-end OBD-II tools, and we built it into the hardware from day one. Two of the ADS1115's four channels are dedicated to OBD-II voltage sensing, the other two are available for external sensors via a 4-pin JST header.
What separates the CEH Scanner from every gauge and logger on the market. The device captures the data. The AI explains what it means, correlates multiple data streams, and walks you through the fix.
| Code Context | DTC + freeze frame + live data → AI diagnosis with confidence score |
| Pattern Detection | Logged data analyzed for intermittent faults, trends, degradation |
| Guided Testing | Step-by-step circuit tests with expected voltage ranges for your vehicle |
| Parts + Cost | Matched parts, estimated repair cost, DIY difficulty rating |
Professional tools give you numbers. The CEH Scanner gives you answers. Combine live data, freeze frames, stored codes, and logged sessions into one AI context window that knows your specific vehicle, its history, and the most likely root cause.
Same hardware at every tier. The device works as a code reader out of the box, no subscription required. Upgrade to unlock the features that matter to you.
The scanner works forever as a code reader. No subscription, no expiration, no paperweight.
Full gauge dashboard, manufacturer PIDs, data logging, performance testing, and external sensor overlay.
Bidirectional control, actuation tests, guided diagnostics, circuit testing, and AI analysis.
The scanner market is fragmented. You need one tool for gauges, another for logging, another for codes, another for bidirectional. Here's what a single CEH Scanner replaces:
| Feature | CEH Scanner | nGauge ($350) | nDash ($500) | OBDLink MX+ ($100) |
|---|---|---|---|---|
| Read/Clear Codes | ✓ | ✓ | ✓ | ✓ |
| Real-Time Gauges | ✓ | ✓ | ✓ | ✗ |
| Performance Timer | ✓ | ✗ | ✓ | ✗ |
| Data Logging to SD | ✓ | ✗ | ✓ | ✗ |
| Manufacturer PIDs | ✓ | ✓ | ✓ | ✗ |
| External Sensor Input | ✓ | ✓ | ✗ | ✗ |
| Wireless Data Stream | ✓ | ✗ | ✗ | ✓ |
| AI Diagnostics | ✓ | ✗ | ✗ | ✗ |
| Guided Circuit Tests | ✓ | ✗ | ✗ | ✗ |
| Bidirectional Control | ✓ | ✗ | ✗ | ✗ |
| OTA Firmware Updates | ✓ | ✗ | ✗ | ✗ |
| Open Hardware | ✓ | ✗ | ✗ | ✗ |
| Built-in Battery | ✓ | ✗ | ✗ | ✗ |
Feature comparison based on publicly available product specifications as of 2025. CEH Scanner features reflect the full Scanner-tier subscription. All product names are trademarks of their respective owners and are used here solely for identification and comparison purposes. nGauge® is a trademark of Patriot Diagnostics. nDash™ is a trademark of Drew Technologies. OBDLink® is a registered trademark of ScanTool.net. Check Engine Help is not affiliated with, endorsed by, or sponsored by any of these companies.
Every CEH Scanner ships with identical hardware. Your subscription tier determines which features are unlocked in software. This is the same model that works across industries:
Ford vehicles ship with backup camera wiring pre-installed. The harness is there, the module is there. FORScan activates it by writing a single PID to the BCM. Same hardware, same wiring — just a software flag.
ZOLL ships every cardiac monitor as a 12-lead. They gate it to 3-lead in software. It costs more to build the gated version because of the software lock. The capability is already in the hardware — you're paying for the unlock.
Firmware updates, companion apps for Windows/macOS/iOS/Android, and release notes.
Schematics, PCB layout, pinout diagrams, BOM breakdown, and design documentation.
Why this device exists, the engineering gap, and how it compares to $8,000 professional tools.
