# 1997

**URL:** <https://community.cartalk.com/t/topic/52849>\
**Category:** Maintenance/Repairs\
**Created:** [August 2, 2010, 2:17pm UTC](https://community.cartalk.com/t/topic/52849 "2010-08-02T14:17:46Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![bedrock](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/bedrock/32/868_2.png) [@bedrock](https://community.cartalk.com/u/bedrock)\
**Post date:** [August 2, 2010, 2:17pm UTC](https://community.cartalk.com/t/topic/52849/1 "2010-08-02T14:17:46Z")

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i have a 1997 nissan pickup 2.4 liter.the check engine light came on.had code read (p o 402) egr flow.do i need a new egr valve or could something be stop up.egr valve was replace about 50,000 mile ago.

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**Author:** ![cigroller](https://avatars.discourse-cdn.com/v4/letter/c/c68b51/32.png) [@cigroller](https://community.cartalk.com/u/cigroller)\
**Post date:** [August 2, 2010, 2:27pm UTC](https://community.cartalk.com/t/topic/52849/2 "2010-08-02T14:27:05Z")

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There’s a good chance that you just need to clean up all of the passages. Here is a great article I have bookmarked: [http://www.engine-light-help.com/egr-valve.html](http://www.engine-light-help.com/egr-valve.html)

This should also be helpful: [http://www.obd-codes.com/p0402](http://www.obd-codes.com/p0402)

I would just check for blockages first and worry about the more complicated testing if that doesn’t turn up anything.