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P0401 code: meaning, symptoms, causes (& how to fix it)
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![[followup #2] so error P0401 was caused by a faulty EGR cooler. It was](https://i2.wp.com/preview.redd.it/b7wznvafswg91.jpg?auto=webp&s=b57b984d6a55190b394813ed8c429a14328f5583)