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Free ECU & diagnostic tools for workshops
Workshop-grade lookups built on top of Softechpro's catalog of 1,400+ ECU files and 1,582 standardised SAE J2012 DTC codes. Use freely — no account required.
DTC Code Lookup
Type any Pxxxx, Cxxxx, Bxxxx or Uxxxx OBD-II code and get its SAE J2012 meaning, category, and tuning context instantly. 1,582 codes indexed.
VIN Decoder
Decode any 17-character VIN: manufacturer, country, model year, plant code, check-digit validation. Built-in WMI table for 80+ makers, no API calls.
Stage Tuning Power Calculator
Estimate Stage 1 / Stage 2 / Stage 3 power and torque gains for your engine. Separate diesel, petrol turbo, and petrol NA curves with conservative real-world multipliers.
Lambda / AFR Converter
Convert between Lambda (λ), AFR and equivalence ratio (φ) for gasoline, diesel, E85, methanol, LPG and CNG. See lean/stoich/rich state at a glance.
ECU Checksum Detector
Drop your ECU .bin to identify the checksum format: Bosch outer CRC, Delphi sum, Siemens hash, FRF wrapper. Runs 100% in your browser — file never leaves.
HEX / S19 / BIN Inspector
Parse Intel HEX, Motorola S-Record, raw binary or FRF wrapper. Address range, byte count, segments, head/tail bytes — all client-side.
Compression Ratio Calculator
Static CR from bore × stroke × chamber × gasket × deck × dish/dome. Plus displacement in cc, litres and cu-in.
OBD-II Connector Pinout
Visual reference for the 16-pin OBD-II J1962 connector — CAN-H, CAN-L, K-Line, J1850 PWM/VPW pin mapping by protocol.
CAN-BUS Reference
CAN-H / CAN-L bit timing reference, ISO 11898 vs ISO 15765-4 differences, UDS service IDs, and common bus speeds per manufacturer.
Full DTC Code Browser
Browse the entire SAE J2012 standard — Pxxxx powertrain, Cxxxx chassis, Bxxxx body, Uxxxx network codes. Organised by family and by system.
ECU Database
800+ ECU references across Bosch, Siemens / Continental, Delphi, Magneti Marelli — each with tier coverage info and tuning context.
Vehicle Catalog
130+ automotive brands with thousands of model entries — click any brand for its full model + engine list and which ECUs are typically found in each.
About these tools
These tools are part of Softechpro Solutions, a professional ECU tuning software for off-road and motorsport workshops. The lookups draw from the same catalogs that power the paid Softechpro V5 desktop tool — but the lookups themselves are free to use without an account.
If a tool you need isn't here yet, ask us — we ship workshop tools in response to real workshop demand.