P1153 BUICK – Diagnosis and Solutions
🔧 Possible Causes
⚠️ Issues to investigate:
- 📡 Faulty HO2S Sensor (Bank 2, Sensor 1)
- 🔌 Damaged Wiring Harness (open or short circuit)
- 🔋 Faulty Electrical Connection (corrosion, broken pins)
🛠️ Repair Procedure
🔄 Key steps to resolve code P1153:
- 🔍 Visual Inspection:
- Check the HO2S wiring and connectors (look for corrosion, cut wires).
- 🧪 HO2S Sensor Test:
- Measure sensor voltage with a multimeter (expected values: 300 mV to 600 mV).
- 🔄 Transition Check:
- Use a diagnostic tool to check the number of rich/lean switches over 100 seconds.
- ⚡ Replacement/Repair:
- Replace the HO2S sensor or repair the wiring harness if necessary.
🚨 Common Symptoms
❗ Warning signs:
- 🚦 Check Engine Light On
- 📉 Abnormal Air-Fuel Mixture (increased consumption, unstable idle)
📖 Meaning of Code P1153
🔌 Technical explanation:
- The PCM detects insufficient switching of the HO2S (Bank 2, Sensor 1) between rich (>600 mV) and lean (<300 mV) states for 100 seconds.
- 📉 This fault disrupts air-fuel mixture control, affecting emissions and performance.
⚠️ Important Tips
- 🔧 Check the Heater Circuit: A faulty HO2S can also be caused by a defective heater element.
- 📲 Use an OBD2 Scanner to observe real-time sensor data and validate transitions.
- 🔄 After repair, clear the code and test the vehicle to confirm resolution.