# Toyota failed emissions codes

**URL:** <https://community.cartalk.com/t/toyota-failed-emissions-codes/52356>\
**Category:** Maintenance/Repairs\
**Tags:** toyota, camry\
**Created:** [July 23, 2010, 10:42pm UTC](https://community.cartalk.com/t/toyota-failed-emissions-codes/52356 "2010-07-23T22:42:17Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![jojo50](https://avatars.discourse-cdn.com/v4/letter/j/8c91f0/32.png) [@jojo50](https://community.cartalk.com/u/jojo50)\
**Post date:** [July 23, 2010, 10:42pm UTC](https://community.cartalk.com/t/toyota-failed-emissions-codes/52356/1 "2010-07-23T22:42:17Z")

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I have a 2000 toyota camry, 4 cycl. It has failed emissions because of two codes: PO401 & PO420. I have had the following replaced: EGR valve vacuum hose, 18TOM downstream O2 sensor, catalytic convertor, and a/f senor (I am not sure about the last). Each time, the check engine light goes off for about 500 miles, just enough to to pass emission but then it goes on again. Any idea what is wrong? It is time for emission test again. Thanks.

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**Author:** ![the\_same\_mountainbike](https://avatars.discourse-cdn.com/v4/letter/t/c89c15/32.png) [@the\_same\_mountainbike](https://community.cartalk.com/u/the_same_mountainbike)\
**Post date:** [July 23, 2010, 11:00pm UTC](https://community.cartalk.com/t/toyota-failed-emissions-codes/52356/2 "2010-07-23T23:00:06Z")

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Did you check the EGR valve and the operation of its vacuum solenoid?

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**Author:** ![Caddyman](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/caddyman/32/23_2.png) [@Caddyman](https://community.cartalk.com/u/Caddyman)\
**Post date:** [July 23, 2010, 11:02pm UTC](https://community.cartalk.com/t/toyota-failed-emissions-codes/52356/3 "2010-07-23T23:02:40Z")

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Are P0401 and P0420 the current codes or are those from a year ago?

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**Author:** ![jojo50](https://avatars.discourse-cdn.com/v4/letter/j/8c91f0/32.png) [@jojo50](https://community.cartalk.com/u/jojo50)\
**Post date:** [July 24, 2010, 6:33pm UTC](https://community.cartalk.com/t/toyota-failed-emissions-codes/52356/4 "2010-07-24T18:33:21Z")

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They are from two years ago.

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**Author:** ![PvtPublic](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/pvtpublic/32/13089_2.png) [@PvtPublic](https://community.cartalk.com/u/PvtPublic)\
**Post date:** [July 24, 2010, 9:43pm UTC](https://community.cartalk.com/t/toyota-failed-emissions-codes/52356/5 "2010-07-24T21:43:17Z")

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What are the codes from this instance? The codes from 2 years ago are not relevant.