P2577 — Direct Ozone Reduction Catalyst…

What this code means

Diagnostic trouble code P2577 indicates: Direct Ozone Reduction Catalyst Efficiency Below Threshold. It was set by your vehicle's onboard diagnostics system and will typically keep the check engine light on until it's addressed.

ECUs that can switch off P2577

P2577 is part of the Lambda / O2 OFF group. These ECUs support Lambda / O2 OFF, which switches it off:

DODGE / JEEP / CHRYSLER

Continental GPEC2A Continental GPEC3 Continental GPEC2 Continental GPEC5 Continental GPEC4 Continental GPEC4LM

GM GROUP (BUICK CADILLAC CHEVROLET OPEL)

DELCO E38 DELCO E92 DELCO E78 DELCO E88 DELCO E84 DELCO E37 DELCO E90

KIA / HYUNDAI

Delphi DCM6.2AP Kefico CPEGP 3.XX.X Kefico CPEGD 3.XX.X Kefico CPGPSH 3.XX.X Delphi DCM7.1AP

NISSAN / INFINITI

Hitachi SH7055 Hitachi SH7058 Hitachi SH72531 Hitachi SH7059 Hitachi SH72533 Hitachi SH72544 Hitachi RH850

TATA

Delphi DCM7.1AP

TOYOTA / LEXUS | PETROL

DENSO GEN1 DENSO GEN2 DENSO GEN3 DENSO GEN4 DENSO GEN3 GR86

Remove P2577 permanently

Upload your ECU file and DTC Doctor will detect this code (and any others) automatically, then remove it for good — no dealer visit, no guesswork.

Analyze My File Free →