Fault code P1158 – a step-by-step guide to diagnosing and fixing it

Error code P1158 is displayed and the check engine light is on - what does this mean?

The DTC P1158 is a manufacturer-specific fault code that is recognized by the OBD system and indicates a problem with the fuel pump control system or fuel pressure regulation. This trouble code mainly occurs in vehicles from certain manufacturers and can have different meanings depending on the brand.

What causes can this error code have?

• Defective fuel pump or fuel pump relay
• Damaged or clogged fuel filter system
• Faulty fuel pressure sensors
• Loose or corroded plug connections in the fuel system
• Defective fuel pressure regulation
• Damaged cable connections to the fuel pump
• Clogged fuel lines
• Faulty engine control unit software

What symptoms occur in parallel with fault code P1158?

• Starting problems: The vehicle is difficult to start or does not start at all
• Loss of power: Noticeable reduction in engine power while driving
• Irregular idling: Engine runs unevenly or stutters when idling
• Fuel consumption: Increased consumption due to inefficient fuel supply
• Jerking: Vehicle jerks especially when accelerating or under load
• Stalling: Engine stalls while driving or when stationary

How can the problem with error code P1158 be rectified?

• Correction requires a systematic diagnosis of the fuel system and appropriate repair measures.
• Check the fuel pump and fuel pump relay and replace completely if defective, including checking the electrical connections
• Replace the fuel filter and check the entire fuel line system for blockages and clean it
• Test the fuel pressure sensor with a multimeter and replace with a new sensor if the readings are incorrect
• Clean all plug connections in the fuel system, check for corrosion and treat with contact spray
• Remove fuel pressure regulator, test and replace with new part if malfunctioning
• Check wiring harness to fuel pump for damage and repair defective areas or replace cable
• Update the engine control unit software or perform a reset and delete the fault memory