BMW Diagnostic Trouble Code P1169 - BMW - Fuel Trim Bank 2 Too Lean

Code Definition: P1169 - Fuel Trim Bank 2 Too Lean

The P1169 code is a generic trouble code that indicates the fuel trim system in bank 2 is too lean. This means that there is not enough fuel being delivered to the engine, which can cause poor engine performance and decreased fuel efficiency.

Possible Causes:

• Faulty fuel injectors
• Clogged fuel filter
• Malfunctioning fuel pressure regulator
• Vacuum leaks in the intake manifold
• Malfunctioning idle air control valve
• Incorrect fuel trim settings
• Low fuel pressure

Symptoms:

• Illuminated check engine light
• Poor engine performance
• Rough idling
• Decreased fuel efficiency
• Difficulty starting the engine

Diagnostic Procedure:

1. Use a scan tool to retrieve the trouble code and view the freeze frame data to determine when the code was set and under what operating conditions.
2. Inspect the fuel system for any signs of leaks, blockages, or other issues.
3. Check the fuel filter and replace it if necessary.
4. Test the fuel injectors and replace them if they are found to be faulty.
5. Check the fuel pressure regulator and replace it if necessary.
6. Inspect the intake manifold for vacuum leaks and repair them as needed.
7. Check the idle air control valve and replace it if necessary.
8. Adjust the fuel trim settings to the correct specifications.
9. Check the fuel pressure and make sure it is within the manufacturer's specified range.
10. Clear the code and perform a road test to see if the condition persists. If the code does not return, the problem may have been intermittent or related to a loose connection.
11. If the code returns, consider replacing the fuel pump or fuel rail if necessary.

Repair Information:

1. Replace the faulty fuel injectors.
2. Replace the clogged fuel filter.
3. Replace the malfunctioning fuel pressure regulator.
4. Repair any vacuum leaks in the intake manifold.
5. Replace the malfunctioning idle air control valve.
6. Adjust the fuel trim settings to the correct specifications.
7. Replace the fuel pump or fuel rail if necessary.
8. Check the fuel pressure and make sure it is within the manufacturer's specified range.

It's important to note that this is a general guide and the exact repair procedure may vary depending on the year, make, and model of your BMW. Always consult a professional mechanic if you're unsure about how to diagnose or repair an issue with your vehicle.************************ **************