- Faulty HO2S (Heated Oxygen Sensor) sensor
-Wiring issues, such as frayed or shorted wires
- Problems with the PCM (Powertrain Control Module), ECM (Engine Control Module) or other control units
- Vacuum leaks in the intake system and exhaust system
- Incorrect fuel pressure or fuel pump issues
- Catalytic converter issues
Troubleshooting Steps:
1. Verify Wiring: Check the electrical wiring between the affected HO2S sensor and the PCM. Look for any signs of damage or wear and tear.
2. Check for Vacuum Leaks: Inspect the intake system and exhaust system for any leaks or loose connections.
3. Check Fuel Pressure: If the incorrect fuel pressure is suspected, use a fuel pressure gauge to test and ensure it meets the manufacturer's specifications.
4. Inspect O2 Sensor: Check the O2 sensor that was recently installed. Ensure it is compatible with the vehicle and correctly connected.
5. Scan the PCM for Additional Trouble Codes: Use a scan tool to perform a comprehensive diagnostic scan on the PCM and check for any other related codes that might provide more insights into the issue.
6. Perform Specialized Diagnostics: If the problem persist, advanced diagnostics may be required. This could include testing HO2S sensor outputs, monitoring fuel trims, and performing component activation tests.
Note that fixing P1151 code may involve specialized knowledge and tools, so seeking professional assistance from a qualified mechanic or repair shop is recommended if the issue persists after performing the initial checks and troubleshooting steps.
