Catalog
Codes we can read today
These are codes we already have a plain-English page for. New codes appear after we can show a source. This is not every code a scanner can print. If we do not have a source, we say so.
Shared names vs brand-owned codes
- P0420Catalyst System Efficiency Below Threshold (Bank 1)Shared · Exhaust cleaner
- P0300Random/Multiple Cylinder Misfire DetectedShared · Engine skip
- P0171System Too Lean (Bank 1)Shared · Fuel mix
- P0455Evaporative Emission System Leak Detected (large leak)Shared · Fuel vapor
- P0442Evaporative Emission System Leak Detected (small leak)Shared · Fuel vapor
- P0133O2 Sensor Circuit Slow Response (Bank 1 Sensor 1)Shared · Oxygen sensor
- P0401Exhaust Gas Recirculation Flow Insufficient DetectedShared · Exhaust recirculation