DTC P1134: Heated Oxygen Sensor No. 1 Transition Time Ratio: Description

PCM continuously monitors the Heated Oxygen Sensor (HO2S) activity for 100 seconds. During this period, PCM counts the number of times that HO2S responds from rich-to-lean and from lean-to-rich and adds the amount of time required to complete all the transitions. With this information, an average time for all the transitions can be determined. PCM then divides the rich-to-lean average by the lean-to-rich average to obtain a ratio. If HO2S transition time ratio is not within the appropriate range, DTC is set, indicating that the oxygen sensor is not responding as expected to changes in exhaust oxygen content.