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What is the code P0401 mean and how do you fix the problem on a 2000 Pontiac Bonneville?
Wiki User
∙ 17y ago
Well luckily for you I'm working on a 2000 Bonneville non supercharged car right now. Same code... I can hear a hissing noise from the passenger side of the engine.... found the actual map sensor has come apart.... maybe this will be your problem. Good luck.
Wiki User
∙ 16y ago
Wiki User
∙ 17y agoP0401 Exhaust Gas Recirculation Flow Insufficient Detected
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