obdex

The complete open database of OBD-II diagnostic trouble codes and PIDs.

100 % complete · all 7 families
9,533codes
132PIDs
23,768causes
24,251symptoms
26,682cross-refs
18,621sources
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Quick search

Look up any code, keyword or PID right here — the full database is loaded into your browser.

Try: P0420 · oxygen sensor · Lambdasonde · 0C (PID) · 01:0C (Mode 01 PID 0C)

Coverage

Every code carries the full schema: bilingual title and description, affected components, common causes with likelihood, repair difficulty / cost / hours, MIL / emissions / limp-mode flags, related codes, and at least one public source.

FamilyCodesCoverage
P0 Powertrain3,705
100 %
P2 Powertrain (SAE)3,495
100 %
P3 Powertrain (mixed)155
100 %
U0 Network1,055
100 %
U3 Network (HV / FCEV)174
100 %
B0 Body323
100 %
C0 Chassis626
100 %
All generic9,533
100 %

Use the data

All endpoints are static JSON over GitHub Pages. No auth, no rate limit. Each has a minified .min.json sibling for production.