OBD-II trouble codes

P0171 code — System Too Lean
P0300 code — Random/Multiple Cylinder Misfire Detected
P0420 code — Catalyst System Efficiency Below Threshold (Bank 1)
P0455 code — Evaporative Emission System Large Leak Detected
P0456 code — Evaporative Emission System Leak Detected (Very Small Leak)

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