Ford
Type:
    Powertrain - Auxiliary Emission Controls - ISO/SAE Controlled
Description:
    Catalyst System Efficiency Below Threshold Conditions
Cause:
    Engine running at steady state highway conditions for 5 minutes in closed loop, then the PCM detected that the rear HO2S switch rate was too high

Generic
Type:
    Powertrain - Auxiliary Emission Controls - ISO/SAE Controlled
Description:
    Catalyst System Efficiency Below Threshold

GM
Type:
    Powertrain - Auxiliary Emission Controls - ISO/SAE Controlled
Description:
    Catalyst System Low Efficiency Conditions
Cause:
    No AIR, CKP, CMP, ECT, EVAP, IAT, MAF, MAP, HO2S (Left Bank), Misfire, Fuel Trim (Left Bank), Injector, TP, Transmission or VSS codes set, in closed loop, ECT input over 124°F, VSS from 20-75 mph, throttle angle over 2%, engine speed below 3500 rpm, MAP input 25-80 kPa, MAF input 15-100 g/sec, then the PCM determined the Bank 2 Catalyst had degraded below its threshold

Nissan
Type:
    Powertrain - Auxiliary Emission Controls - ISO/SAE Controlled
Description:
    Catalytic converter - Bank 2 - efficiency below limit
Cause:
    Catalytic converter, wiring, intake/exhaust system, injector, ECM