Engine
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    Why Has My Engine Lost Power?

    Typical repair cost: $50–$4,500

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    Common Symptoms

    Won't accelerate past 40 mph
    Limp mode
    Check engine light
    Reduced power message
    Hesitation on hills

    Most Likely Causes

    1

    Limp mode triggered

    ECU pulls power to protect a failing component — scan for the trigger code.

    2

    Failed MAF sensor

    Wrong airflow reading kills fueling and timing.

    3

    Clogged catalytic converter

    Restricted exhaust caps RPM and creates extreme heat.

    4

    Failing fuel pump or filter

    Engine starves under load.

    5

    Boost leak / failing turbo

    On boosted engines, no boost = no power.

    6

    TPS / APP sensor fault

    Codes P2122/P2138 — ECM ignores pedal input.

    How a Shop Diagnoses It

    1. 1.Scan ALL modules — not just the engine.
    2. 2.Smoke-test for boost leaks on turbo engines.
    3. 3.Fuel pressure test under load.
    4. 4.Backpressure test for clogged cat.

    When to see a professional

    Limp mode is the ECU protecting itself — don't reset and keep driving; you'll only mask the underlying failure.

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    Related Engine problems

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    $100–$1800 typical repair
    Flashing CEL
    $80–$2000 typical repair
    Engine knocking
    $50–$8000 typical repair

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