p2189 Range Rover & Fault code overview

The P2189 code in a Range Rover typically refers to a "System Too Lean Bank 2," meaning the engine control module (ECM) has detected that the air-fuel mixture on Bank 2 (the side of the engine opposite the driver's side, or the second set of cylinders) is too lean. This could be due to several factors, such as:

1. Faulty Oxygen Sensor: A malfunctioning sensor could be giving incorrect readings, leading the ECM to adjust the fuel mixture.
2. Vacuum Leaks: A vacuum leak can allow extra air into the engine, causing the mixture to go lean.
3. Dirty or Faulty Mass Airflow Sensor (MAF): A failing MAF sensor could provide incorrect air intake readings.
4. Fuel Delivery Issues: A clogged fuel filter or failing fuel pump could prevent adequate fuel from reaching the engine.
5. Faulty Fuel Injectors: If the injectors are not providing enough fuel, it can cause a lean condition.
6. Exhaust Leaks: A leak in the exhaust system before the oxygen sensors can skew readings.

P2189 Range Rover: To diagnose the issue, you should:

• Inspect for vacuum leaks or cracks in hoses.
• Check fuel pressure and fuel injectors for proper function.
• Inspect the oxygen sensors and MAF sensor.
• Ensure there are no exhaust leaks affecting the sensors.

A professional diagnostic scan and possibly some hands-on inspection would be necessary to pinpoint the exact cause.