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Our automotive experts have put together the following information about the P2191 diagnostic trouble code. We've provided the common symptoms that occur when this code is set along with the frequent repairs that address the issues related to the P2191 code.

OBD II Fault Code

  • OBD II P2191

    OBD-II Code Decreased engine performance is defined as a System Too Lean at Higher Load

    The engine control module (PCM) uses multiple sensors to determine the required amount of fuel needed to keep the engine running efficiently. If the PCM cannot achieve the desired balance between fuel and air, it will set code P2191.

    Decreased engine performance Symptoms

    • Decreased engine performance
    • Increased fuel consumption

    Common Problems That Trigger the P2191 Code

    • Clogged air filter
    • Damaged or contaminated spark plug
    • Engine sensor failure
    • Exhaust leak
    • Fuel injector failure
    • Powertrain Control Module (PCM) software needs to be updated
    • The fuel does not meet the manufacturer's requirements

    Common Repairs Needed for the P2191 Code

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