BMW Diagnostic Trouble Codes
Common OBD2 fault codes found on BMW vehicles with model-specific causes, known issues, TSBs, and adjusted repair cost estimates. Each guide is tailored for BMW owners.
Electrical
"A" Camshaft Position Actuator Circuit (Bank 1)
BMW 3 Series • 2005-2024
BMW VANOS solenoids on the N52 and N54 engines are a common failure point. BMW calls this the VANOS ...
Engine Overspeed Condition
BMW 3 Series • 2005-2024
BMW models with the ZF 8-speed automatic can occasionally log P0219 during aggressive Sport mode dri...
System Voltage Low
BMW 3 Series • 2005-2024
BMW uses an intelligent battery sensor (IBS) on the negative terminal that can fail and give false l...
ECM/PCM Processor Fault
BMW 3 Series • 2005-2024
The E90/F30 3 Series with N52 and N55 engines can trigger P0606 due to DME (Digital Motor Electronic...
Emissions
"A" Camshaft Position - Timing Over-Advanced or System Performance (Bank 1)
BMW 3 Series • 2005-2024
The N52 and N54 engines are known for VANOS system issues causing P0011. BMW recommends oil changes ...
O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 1)
BMW 3 Series • 2006-2024
BMW upstream sensors on N52/N55/B48 are Bosch units. The N55 turbo setup puts the sensor in an extre...
O2 Sensor Heater Circuit Malfunction (Bank 1, Sensor 2)
BMW 3 Series • 2006-2024
BMW uses Bosch sensors. The N52 downstream sensor is accessible but may require removing an underbod...
Exhaust Gas Recirculation (EGR) Flow Insufficient
BMW 3 Series • 2006-2024
BMW diesel engines (N47, B47) are particularly prone to EGR issues. The EGR valve and cooler assembl...
Secondary Air Injection System Malfunction
BMW 3 Series • 2006-2020
The N52 and N55 engines use an electric secondary air pump that commonly fails after 80,000-120,000 ...
Secondary Air Injection System Incorrect Flow Detected
BMW 3 Series • 2006-2020
On the N52 engine, P0411 is frequently caused by a deteriorated check valve that allows exhaust gas ...
Catalyst System Efficiency Below Threshold (Bank 1)
BMW 3 Series • 2006–2024
BMW 3 Series with N52/N55 engines commonly trigger P0420 alongside VANOS-related codes. The catalyti...
Catalyst System Efficiency Below Threshold (Bank 2)
BMW 3 Series • 2006-2024
BMW inline-6 engines (N52, N55, B58) are single-bank and won't produce P0430. However, the older E90...
Diesel Particulate Filter Efficiency Below Threshold (Bank 1)
BMW 3 Series • 2005-2024
The E90/F30/G20 320d and 330d are widespread diesel models in Europe that commonly trigger P2002. BM...
Ignition
Crankshaft Position - Camshaft Position Correlation (Bank 1 Sensor A)
BMW 3 Series • 2006-2024
The N47 diesel (if applicable) and N20/N26 4-cylinder turbos are known for timing chain issues. The ...
Crankshaft Position Sensor "A" Circuit Malfunction
BMW 3 Series • 2005-2024
The N46 and N52 engines have the crankshaft sensor at the rear of the block near the flywheel, requi...
Camshaft Position Sensor Circuit Malfunction
BMW 3 Series • 2006-2024
BMW inline-6 engines (N52, N55, B58) have intake and exhaust CMP sensors. P0340 typically refers to ...
Fuel System
Fuel Rail/System Pressure - Too Low
BMW 3 Series • 2006-2024
The N54 twin-turbo engine is notorious for high-pressure fuel pump (HPFP) failures causing P0087. BM...
Mass Air Flow Sensor Range/Performance
BMW 3 Series • 2006-2024
BMW uses Bosch MAF sensors. The N52 intake boot (between MAF and throttle body) is a notorious failu...
System Too Lean (Bank 1)
BMW 3 Series • 2006–2024
BMW 3 Series with the N52 engine is notorious for DISA valve and intake manifold flap failures causi...
System Too Rich (Bank 1)
BMW 3 Series • 2006-2024
The N52 and N55 engines are prone to VANOS solenoid issues that can cause P0172 by altering valve ti...
System Too Lean (Bank 2)
BMW 3 Series • 2006-2024
BMW inline-6 engines (N52, N55, B58) are single-bank and won't produce P0174. The V8 S65 (E90 M3) an...
Fuel Rail Pressure Sensor Circuit Range/Performance
BMW 3 Series • 2006-2024
The N54 and N55 engines have a fuel rail pressure sensor that can fail and mimic HPFP symptoms. BMW ...
Turbocharger/Supercharger "A" Overboost Condition
BMW 3 Series • 2006-2024
The N54 twin-turbo engine uses electronic wastegate actuators that can fail, causing overboost. The ...
Idle Control System RPM Higher Than Expected
BMW 3 Series • 2006-2024
BMW electronic throttle bodies on N52/N55/B48 can develop carbon deposits. The N52 is especially pro...
System Too Lean at Idle (Bank 1)
BMW 3 Series • 2005-2024
The E90/F30 with N52 and N55 engines is prone to P2187 due to the DISA valve (intake manifold flap) ...
System Too Rich at Idle (Bank 1)
BMW 3 Series • 2005-2024
The E90/F30 with N52 and N55 engines can trigger P2188 from leaking direct fuel injectors and a faul...
Cooling System
Misfire
Random/Multiple Cylinder Misfire Detected
BMW 3 Series • 2006–2024
The N54 twin-turbo engine is notorious for failing ignition coils and spark plugs that trigger P0300...
Cylinder 1 Misfire Detected
BMW 3 Series • 2006-2024
The N54 and N55 engines are notorious for ignition coil failures. Cylinder 1 is at the front of the ...
Cylinder 3 Misfire Detected
BMW 3 Series • 2006-2024
On the N52 and N54 engines, cylinder 3 is centrally located and tends to run hotter than outer cylin...
EVAP System
Evaporative Emission System Leak Detected (Small Leak)
BMW 3 Series • 2006-2024
BMW vehicles use a leak detection pump (LDP) to test the EVAP system. A failing LDP can falsely trig...
Evaporative Emission System Vent Control Circuit
BMW 3 Series • 2006-2024
BMW EVAP systems are more complex than most, with multiple valves and a fuel tank leak detection pum...
Transmission
Transmission Control System Malfunction
BMW 3 Series • 2006-2024
The F30/G20 3 Series uses the ZF 8HP automatic transmission, which is generally reliable but can tri...
Torque Converter Clutch Circuit Performance/Stuck Off
BMW 3 Series • 2006-2024
The F30/G20 3 Series with the ZF 8HP automatic transmission can develop P0741 when transmission flui...
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