DTC P1134: Ho2S Transition Time Ratio - Bank 1, Sensor 1: Description

The Powertrain Control Module (PCM) continuously monitors the Heated Oxygen Sensor (HO2S) activity. The PCM counts the number of times that the HO2S responds by switching from a rich state to a lean state. Next, the PCM adds the amount of time the HO2S took to complete all transitions during the 100-second test period. With this information, an average time for all transitions can be determined. The PCM then divides the rich-to-lean average by the lean-to-rich average to obtain a ratio. If the HO2S transition time ratio is not within range, this Diagnostic Trouble Code (DTC) will set. The setting of this DTC indicates that the oxygen sensor is not responding as expected, to changes in exhaust oxygen content.