Land Rover DTC P1171 – Oxygen Sensor System Too Lean Fault Banks A & B
DTC P1171 meaning on Land Rover
DTC P1171 on a Land Rover indicates an Oxygen Sensor System Too Lean Fault in Banks A & B. This fault code is triggered when the Engine Control Module (ECM) detects that the air-fuel mixture is too lean in both bank A and bank B of the engine.
Land Rover DTC P1171 symptoms
Symptoms of DTC P1171 on a Land Rover may include:
- Check Engine Light illuminated
- Decreased fuel efficiency
- Engine running rough or misfiring
- Reduced engine performance
Land Rover DTC P1171 causes
Common causes of DTC P1171 on a Land Rover include:
- Faulty oxygen sensor
- Vacuum leaks in the intake system
- Fuel delivery issues
- Exhaust leaks
Land Rover DTC P1171 seriousness
DTC P1171 should not be ignored as it can lead to poor engine performance, reduced fuel efficiency, and potential damage to the catalytic converter over time if left unresolved.
How to diagnose DTC P1171 on Land Rover
To diagnose DTC P1171 on a Land Rover, a mechanic may perform the following steps:
- Scan the vehicle’s ECM for fault codes
- Inspect the oxygen sensors for proper operation
- Check for vacuum leaks in the intake system
- Test fuel delivery system for proper function
How to fix DTC P1171 on Land Rover
To fix DTC P1171 on a Land Rover, the following steps may be taken:
- Replace faulty oxygen sensors
- Repair any vacuum leaks in the intake system
- Address fuel delivery issues
- Fix any exhaust leaks
How to erase DTC P1171 on Land Rover
To erase DTC P1171 on a Land Rover, the fault code can be cleared using a diagnostic scan tool. After the necessary repairs have been made, the code can be cleared to reset the Check Engine Light.
Recommended tools for Land Rover diagnostics
Explore our expert picks: The Best OBD2 Scanners for 2025
Easy-to-use Multimeter for reliable diagnostics: AstroAI Auto-ranging Multimeter
Some of the links on this page may be affiliate links, which means we may earn a small commission if you make a purchase. This helps us keep our DTC database up to date and provide valuable content for free. We only recommend products that we have tested and believe to be the best in their class.