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First generation of Toyota's full-size SUV.

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P0303 check engine code

How to fix a P0303 check engine light code

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What causes the P0303 code?

  • Faulty spark plugs
  • Fuel injection issues
  • Plug wires, cap and rotor, or coil pack issues (depending on what vehicle is equipped with)
  • Mechanical engine issue
  • Intake air leaks

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