Fault code P1912 – a step-by-step guide to diagnosing and fixing it

Error code P1912 is displayed and the check engine light is on - what does this mean?

The DTC P1912 is recognized by the OBD/EOBD system and indicates a fault in the exhaust gas recirculation (EGR) or turbocharger area. This manufacturer-specific trouble code mainly affects the boost pressure system and can have different meanings for different vehicle brands.

What causes can this error code have?

• Defective boost pressure sensor
• Damaged vacuum hoses on the turbocharger
• Faulty EGR valve control
• Loose or corroded plug connections
• Faulty wastegate control
• Clogged air filter or intake ducts
• Defective solenoid valve in the boost pressure system
• Mechanical damage to the turbocharger
• Faulty engine control unit software

What symptoms occur in parallel with error code P1912?

• Loss of power: Significantly reduced engine power, especially at higher engine speeds
• Unsteady engine running: Engine runs unevenly or jerks while driving
• Increased fuel consumption: Noticeably higher consumption than usual
• Black smoke: Dark exhaust fumes from the exhaust, especially when accelerating
• Starting problems: Difficulty starting the engine
• Whistling or hissing: Unusual noises from the engine compartment

How to fix the problem of fault code P1912?

• Repairing fault code P1912 requires a systematic approach to identify the exact cause.
• Complete inspection and replacement of all vacuum hoses in the turbocharger system, including leak testing and replacement of damaged lines
• Replacement of the defective boost pressure sensor after prior measurement of the voltage values and comparison with the manufacturer's specifications
• Cleaning or replacement of the EGR valve including associated control components and reprogramming of the control unit
• Inspection and repair of the wastegate control unit including function test and calibration of the control values
• Replacement of the air filter and thorough cleaning of the entire intake system to remove dirt
• Diagnosis and replacement of defective solenoid valves in the boost pressure control circuit with subsequent system calibration