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GTI, Jetta III 2.8L & Passat

  1. Ensure engine coolant temperature is at least 122°F (50°C). Start and allow engine to idle. Disconnect vacuum hose from EGR valve. Connect a hand-held vacuum pump to EGR valve and apply vacuum.
  2. Idle quality should change noticeably. If idle quality does not change, check EGR valve and exhaust manifold for plugging. Replace EGR valve if necessary. After repairs, clear/erase DTC memory.
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