P1154 CHEVROLET - HO2S Transition Time Ratio Bank 2 Sensor 1
Faulty Heated Oxygen Sensor (HO2S) Bank 2 Sensor 1
Heated Oxygen Sensor (HO2S) Bank 2 Sensor 1 harness is open or shorted
Heated Oxygen Sensor (HO2S) Bank 2 Sensor 1 circuit poor electrical connection
When is the code detected?
The P1154 code sets if the HO2S ratio is not within range.
Engine Light ON (or Service Engine Soon Warning Light)
P1154 Chevrolet Description
The Powertrain Control Module (PCM
) continuously monitors the Heated Oxygen Sensor
(HO2S) activity for 100 seconds. During the monitor period the PCM
counts the number of times that the HO2S responds from rich to lean and from lean to rich and adds the amount of time it took to complete all transitions. 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.