2008 Chrysler Grand Caravan P0031 and P0038 O2 Sensor Heaters Fault Diagnosis
I recently encountered persistent OBD2 fault codes P0031 and P0038 on my 2008 Chrysler Grand Caravan. I replaced both oxygen sensors with OEM parts, but the codes remain active. Can anyone provide a step-by-step diagnostic procedure for these specific codes? The vehicle is equipped with a 3.8L engine (or possibly a 3.3L based on some reports), and I'm looking for guidance on how to properly troubleshoot the heater circuit issues in the oxygen sensors.
Based on your vehicle, this appears to be a 3.8L engine model. Did you replace both O2 sensors with OEM parts from a Chrysler dealer? Have you tested the heater circuits for continuity and grounding?\n\nP0031 - O2 Sensor 1/1 Heater Circuit Low:\n- (K99) O2 Sensor 1/1 Heater Control Circuit Shorted to Ground\n- (K99) O2 Sensor 1/1 Heater Control Circuit Open or High Resistance\n- (Z901) Ground Circuit Open or High Resistance\n- Components: 1/1 Oxygen Sensor, Powertrain Control Module (PCM)\n\nP0038 - O2 Sensor 1/2 Heater Circuit High:\n- (K299) O2 Sensor 1/2 Heater Control Circuit Shorted to Voltage\n- (K299) O2 Sensor 1/2 Heater Control Circuit Open or High Resistance\n- (Z901) Ground Circuit Open or High Resistance\n- Components: 1/2 Oxygen Sensor, Powertrain Control Module (PCM)