What does code P1133 mean?

Q: What does code P1133 mean?

HO2S Insufficient Switching. P1133 on a Chrysler vehicle means the upstream heated oxygen sensor (HO2S) on bank 1 is not switching rich-to-lean fast enough for the powertrain control module's (PCM) expectations. The PCM monitors the sensor's voltage transitions over a calibrated time window and sets this code when the switch count falls below the required threshold.

DTC codes / Chrysler codes / P1133

P1133 · ChryslerHO2S Insufficient Switching

P1133 on a Chrysler vehicle means the upstream heated oxygen sensor (HO2S) on bank 1 is not switching rich-to-lean fast enough for the powertrain control module's (PCM) expectations. The PCM monitors the sensor's voltage transitions over a calibrated time window and sets this code when the switch count falls below the required threshold.

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.