# 1999 Lexus ES 300 CEL and PO325

**URL:** <https://community.cartalk.com/t/1999-lexus-es-300-cel-and-po325/177700>\
**Category:** Maintenance/Repairs\
**Tags:** lexus\
**Created:** [June 27, 2021, 10:37pm UTC](https://community.cartalk.com/t/1999-lexus-es-300-cel-and-po325/177700 "2021-06-27T22:37:03Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![J.Dogg](https://avatars.discourse-cdn.com/v4/letter/j/71c47a/32.png) [@J.Dogg](https://community.cartalk.com/u/J.Dogg)\
**Post date:** [June 27, 2021, 10:37pm UTC](https://community.cartalk.com/t/1999-lexus-es-300-cel-and-po325/177700/1 "2021-06-27T22:37:03Z")

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The check engine light came on 2 days ago. The code PO 325 knock sensor #1, bank 1 came up. WHERE is this located and do I need a special socket to change it? Thanks.

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**Author:** ![Nevada\_545](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/nevada_545/32/41232_2.png) [@Nevada\_545](https://community.cartalk.com/u/Nevada_545)\
**Post date:** [June 27, 2021, 11:38pm UTC](https://community.cartalk.com/t/1999-lexus-es-300-cel-and-po325/177700/2 "2021-06-27T23:38:32Z")

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The upper and lower intake manifolds must be remove to access the knock sensors. Inspect the wiring harness for rodent damage.

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**Author:** ![J.Dogg](https://avatars.discourse-cdn.com/v4/letter/j/71c47a/32.png) [@J.Dogg](https://community.cartalk.com/u/J.Dogg)\
**Post date:** [June 27, 2021, 11:53pm UTC](https://community.cartalk.com/t/1999-lexus-es-300-cel-and-po325/177700/3 "2021-06-27T23:53:15Z")

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Thank You.