What does code P1154 mean?

Q: What does code P1154 mean?

HO2S Transition Time Ratio. P1154 on Chrysler vehicles indicates that the powertrain control module has detected an abnormal transition time ratio from a heated oxygen sensor (HO2S), meaning the sensor's voltage is not switching from rich to lean as quickly as the computer expects. The PCM compares the actual switching time against a calibrated threshold and sets this code when the ratio falls outside the acceptable window, typically pointing to a lazy or contaminated sensor.

DTC codes / Chrysler codes / P1154

P1154 · ChryslerHO2S Transition Time Ratio

P1154 on Chrysler vehicles indicates that the powertrain control module has detected an abnormal transition time ratio from a heated oxygen sensor (HO2S), meaning the sensor's voltage is not switching from rich to lean as quickly as the computer expects. The PCM compares the actual switching time against a calibrated threshold and sets this code when the ratio falls outside the acceptable window, typically pointing to a lazy or contaminated sensor.

SystemPowertrain

Code typeChrysler specific

SeverityMedium

Fix difficultyIntermediate

AreaFuel and air metering

Guidance is general and written for Chrysler vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.