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Code P0400 comes up on my 2000 Nissan Maxima, what's the most common problem?

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Code P0400 comes up on my 2000 Nissan Maxima, what's the most common problem?

Vehicle: 2000 Nissan Maxima

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Hi there,

The most common problem is the large tube to the egr valve plugging up. If you take it off, you can clean it with brake cleaner and a coat hanger.
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P0400 NISSAN - Exhaust Gas Recirculation Function- No/Low Flow Detected

Read more: https://www.autocodes.com/p0400_nissan.html

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