Is your BMW’s check engine light on? If yes, it indicates a problem in the engine emission system of your vehicle. To identify the issue, you need a specific diagnostic code, which can help pinpoint and resolve the problem. However, for code generation, you need an OBD-II scanner that provides specific codes.
In this article, we provide detailed BMW check engine light codes along with descriptions to help in identifying and resolving problems easily.
Details BMW check engine light Code List:
Below is a detailed list of BMW engine light codes. Each code in the list specifies a specific issue and problem.
1: Camshaft Position Codes:
1.1: P0011 – “A” Camshaft Position – Timing Over-Advanced or System Performance (Bank 1): This code indicates a timing issue with the camshaft on the first bank of cylinders.
1.2: P0012 – “A” Camshaft Position – Timing Over-Retarded (Bank 1): This code indicates a timing problem with the camshaft on the first bank of cylinders.
1.3: P0014 – “B” Camshaft Position – Timing Over-Advanced or System Performance (Bank 1): This code is similar to P0011 but pertains to the second bank of cylinders.
1.4: P0015 – “B” Camshaft Position – Timing Over-Retarded (Bank 1): This code is similar to P0012 but relates to the second bank of cylinders.
2: Fuel/Air Mixture and Misfire Codes:
2.1: P0171 – System Too Lean (Bank 1): This code signifies that the engine is running too lean on the first bank of cylinders, often due to issues like a vacuum leak, faulty oxygen sensor, or low fuel pressure.
2.2: P0174 – System Too Lean (Bank 2): Similar to P0171 but relates to the second bank of cylinders.
2.3: P0172 – System Too Rich (Bank 1): This code indicates that the engine is running too rich on the first bank of cylinders, which may result from issues like a faulty fuel injector or sensor.
2.4: P0175 – System Too Rich (Bank 2): Similar to P0172 but pertains to the second bank of cylinders.
2.5: P0300 – Random/Multiple Cylinder Misfire Detected: This code indicates the presence of misfires occurring in multiple engine cylinders, often caused by ignition problems, fuel delivery issues, or air intake problems.
3: Catalytic Converter Codes:
3.1: P0420 – Catalyst System Efficiency Below Threshold (Bank 1): This code suggests potential problems with the catalytic converter on the first bank of cylinders, possibly due to failing catalytic converters or issues with the upstream oxygen sensor.
3.2: P0430 – Catalyst System Efficiency Below Threshold (Bank 2): Similar to P0420 but pertains to the second bank of cylinders.
4: Exhaust and Emissions Codes:
4.1: P0401 – Exhaust Gas Recirculation (EGR) Flow Insufficient: This code typically indicates a problem with the EGR system, leading to reduced fuel efficiency and increased emissions.
4.2: P0442 – Evaporative Emission Control System Leak Detected (Small Leak): This code suggests a minor leak in the vehicle’s , often caused by issues like a loose or damaged gas cap.
4.3: P0456 – Evaporative Emission Control System Leak Detected (Very Small Leak): Similar to P0442 but indicates a smaller emissions system leak.
5: Cooling System Code:
5.1: P0128 – Coolant Thermostat (Coolant Temperature Below Thermostat Regulating Temperature): This code is often triggered when the engine’s coolant temperature is lower than expected, possibly due to a faulty thermostat.
6: Idle and Control Module Codes:
6.1: P0505 – Idle Air Control System: This code is related to issues with the idle control system, which can lead to idling problems or stalling.
6.2: P0601 – Internal Control Module Memory Check Sum Error: This code suggests a problem with the vehicle’s engine control module (ECM) or computer.
7: Cruise Control and Brake Codes:
7.1: P0571 – Cruise Control/Brake Switch A Circuit Malfunction: This code indicates an issue with the cruise control system or brake pedal position sensor.
8: Additional Codes:
8.1: P0300 – Random/Multiple Cylinder Misfire Detected: This code indicates ignition, fuel, or air system issues. Check spark plugs, spark plug wires, coils, fuel injectors, and the air filter.
8.2: P0171 – System Too Lean (Bank 1): This code suggests a lean mixture caused by a problem with the intake air system, engine management system, or fuel system. Check the mass air flow (MAF) sensor, intake manifold, fuel injectors, and fuel pressure regulator.
8.3: P0420 – Catalyst System Efficiency Below Threshold: This code points to a faulty or contaminated catalytic converter. It may be necessary to replace the catalytic converter.
8.4: P0340 – Camshaft Position (CMP) Sensor Circuit Malfunction: This code indicates that the CMP sensor is not sending accurate signals to the engine control module (ECM). Check the CMP sensor, connector, and wiring.
8.5: P0301 – Cylinder 1 Misfire Detected: This code indicates ignition, fuel, or air system issues in cylinder 1. Check the spark plug, spark plug wire, coil, fuel injector, and valve timing.
8.6: P0302 – Cylinder 2 Misfire Detected: Similar to P0301, but relates to cylinder 2.
8.7: P0303 – Cylinder 3 Misfire Detected: Similar to P0301, but pertains to cylinder 3.
8.8: P0304 – Cylinder 4 Misfire Detected: Similar to P0301, but pertains to cylinder 4.
1: Conclusion:
In conclusion, if your BMW’s check engine light is illuminated, it’s a clear indication of a problem within the engine emission system of your vehicle. To diagnose and resolve the issue effectively, you’ll need specific diagnostic codes, which can be generated using an OBD-II scanner.
2: FAQs
Q: What does the yellow engine warning light in my BMW 3-Series mean?
A: The yellow engine warning light in your BMW 3-Series is also known as the “Check Engine Light” or “Malfunction Indicator Light (MIL).” It illuminates when the vehicle’s onboard computer (ECU) detects a problem in the engine, emissions, or other related systems. It’s a signal that there may be issues that require attention or diagnosis.
Q: My BMW’s check engine light comes on and off. Is it safe to drive with the check engine light on?
A: If your BMW’s check engine light comes on and off intermittently, it’s generally safe to drive in the short term. However, it’s essential to have the issue diagnosed and repaired as soon as possible. Continuous driving with the check engine light on could potentially lead to more severe problems or reduced fuel efficiency.
Q: How can I reset the engine management light in my BMW?
A: Resetting the engine management light in your BMW typically requires addressing the underlying issue that triggered it. Once the problem is resolved, the light should turn off automatically.
If you’ve fixed the problem and the light doesn’t go off, you can also disconnect the car battery for a few minutes to reset the light. However, it’s important to ensure that the problem has been addressed before attempting a reset.
