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    1. Articles
    2. Real fault-code cases
    3. Loss of Power
    4. Page 2 of 2

    Symptom

    Loss of Power

    Cars down on power, often with an underboost code.

    31 cases · Page 2 of 2

    Browse by system

    • Turbo, boost & air intake22
    • Emissions & exhaust6
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    • Diagnosing a P0420 on a 2012 Ford Focus III Emissions & exhaust Sep 16, 2026

      Diagnosing a P0420 on a 2012 Ford Focus III

      A breakdown of a P0420 diagnosis on a 2012 Ford Focus III, exploring catalytic converter degradation, exhaust leaks, and a hidden EVAP purge valve issue.
    • Diagnosing P008791 and Engine Knock on a Mercedes W176 Engine & misfires Sep 15, 2026

      Diagnosing P008791 and Engine Knock on a Mercedes W176

      A diagnostic case study of a 2012 Mercedes A-Class (W176) presenting with a P008791 low fuel pressure code, engine knock, and power loss on acceleration.
    • Diagnosing P2192 and Sluggish Performance on a Kia Venga Fuel system Sep 15, 2026

      Diagnosing P2192 and Sluggish Performance on a Kia Venga

      Explore a real diagnostic case on a 2010 Kia Venga with a P2192 code and sluggish performance. Discover how to test the MAF sensor, injectors, and EVAP.
    • Diagnosing P0011 and P0014 on a 2014 Suzuki Swift Engine & misfires Sep 8, 2026

      Diagnosing P0011 and P0014 on a 2014 Suzuki Swift

      A complete diagnostic walkthrough for a 2014 Suzuki Swift presenting with a lack of power and both P0011 and P0014 timing fault codes.
    • Diagnosing P132B and P2562 on a 2012 Ford Fiesta VI Turbo, boost & air intake Sep 7, 2026

      Diagnosing P132B and P2562 on a 2012 Ford Fiesta VI

      A detailed diagnostic breakdown for a 2012 Ford Fiesta VI with codes P132B and P2562, focusing on the electronic VNT actuator and sticking turbine vanes.
    • Diagnosing P0103 and Black Smoke on a Citroen Jumper III Turbo, boost & air intake Sep 4, 2026

      Diagnosing P0103 and Black Smoke on a Citroen Jumper III

      Explore a real diagnostic case of a 2010 Citroen Jumper III with code P0103, heavy black smoke, and surging, focusing on MAF sensor and circuit faults.
    • Diagnosing P1682 and P0638 on a 2006 Saab 9-3 Battery, charging & power Sep 4, 2026

      Diagnosing P1682 and P0638 on a 2006 Saab 9-3

      A 2006 Saab 9-3 presented with codes P1682 and P0638 and a rough idle. We explore why the root cause was a wiring connector under the battery tray.
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