# Emission control light on and off again

**URL:** <https://community.cartalk.com/t/emission-control-light-on-and-off-again/10028>\
**Category:** Maintenance/Repairs\
**Created:** [January 30, 2008, 7:27pm UTC](https://community.cartalk.com/t/emission-control-light-on-and-off-again/10028 "2008-01-30T19:27:11Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![shabunny](https://avatars.discourse-cdn.com/v4/letter/s/c5a1d2/32.png) [@shabunny](https://community.cartalk.com/u/shabunny)\
**Post date:** [January 30, 2008, 7:27pm UTC](https://community.cartalk.com/t/emission-control-light-on-and-off-again/10028/1 "2008-01-30T19:27:11Z")

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Have a 99 Honda Odyssey, 203,000 miles. The emission control light goes on and then after about 300 miles goes off again. happened twice now, currently off. Mechanic says I need a catalytic converter but i wonder if it could just be a senser. Last catalytic converter put in 115,000miles ago. Any help or opinions out there??

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**Author:** ![NYBo](https://sea1.discourse-cdn.com/cartalk/user_avatar/community.cartalk.com/nybo/32/17281_2.png) [@NYBo](https://community.cartalk.com/u/NYBo)\
**Post date:** [January 30, 2008, 7:36pm UTC](https://community.cartalk.com/t/emission-control-light-on-and-off-again/10028/2 "2008-01-30T19:36:05Z")

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We need to know the exact code(s). Go to AutoZone, Advance Auto Parts, or a similar store for a free error code scan and post the exact number(s) here. They will be in the format of Pxxxx, with the x standing for a numeral.