DTC C121D GMC

Description

Modeled exhaust temp, 300–900 °C Delta engine load, lt;9% Exhaust gas mass flow, 7.5–140 kg h Number of interrupts by acceleration enrichment, gt;40 Lambda control, Closed loop 2nd Lambda control, Closed loop O2S front, Ready, no fault O2S rear, Ready, no fault O2S heater front, Ready, no fault O2S heater rear, Ready, no fault Fuel cut off, Not active Catalyst heating, Not active SAI, Not active 1st Lambda control loop, Not at min or max limit 2nd Lambda control loop, Active 1st Lambda control loop, At min limit O2S front, lt;1.0 O2S rear voltage, lt;0.4 V 1st Lambda control loop, At max limit O2S front, gt;1 O2S rear voltage, gt;0.6 V