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P0438 Code on Isuzu 4JK1 Engine ISUZU D-Max I Platform / Chassis (TFR, TFS) (01.2007 - 06.2012)

M. S.
03.01.2025 20:35
Member

Hi everyone,


I’m experiencing a P0438 error code (Catalyst Temperature Sensor Circuit High, Bank 2) on my Isuzu vehicle with a 4JK1 engine. Has anyone dealt with this issue before?


I’d appreciate any advice on diagnosing and repairing this problem. Are there any common causes specific to the Isuzu 4JK1 engine that I should check? Any tips, insights, or steps to troubleshoot this would be super helpful!


Thanks in advance for your help!


    Started

    03.01.25

    Latest reply

    06.01.25

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    • @Graziana Venturi
      06.01.2025 14:30
      AUTODOC expert
      Hello!
      Inspect the condition of the lambda sensors (oxygen sensors) and exhaust gas temperature sensors on the vehicle. Additionally, check the wiring connected to these sensors for any signs of damage, wear, or disconnection. Faulty sensors or compromised wiring can significantly affect performance and emissions, so ensuring they are in good condition is crucial.
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