# Help!

**URL:** <https://community.cartalk.com/t/help/42186>\
**Category:** Maintenance/Repairs\
**Tags:** code, sensors, l, saturn\
**Created:** [January 10, 2010, 2:14am UTC](https://community.cartalk.com/t/help/42186 "2010-01-10T02:14:31Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![Nahima](https://avatars.discourse-cdn.com/v4/letter/n/eb9ed0/32.png) [@Nahima](https://community.cartalk.com/u/Nahima)\
**Post date:** [January 10, 2010, 2:14am UTC](https://community.cartalk.com/t/help/42186/1 "2010-01-10T02:14:31Z")

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I have a Saturn L300 2003. A few weeks ago my check engine light came on. I went to Auto Zone. They printed out the code to me:  
  
 “catalyst efficiency low-bank 2; the oxygen sensors for the catalytic converters”. OEM Number to cross: P0431"  
  
  
  
 They said its the sensor, now my car has two one in the front and back. I checked with a few mechanics and they all said that the front one is cheapest. The mechanic said if I gave him the code he could tell me which it is. Well I Gave him the code and haven’t heard back in 2 weeks. Can anyone tell me which it is? I found information out on how to change the sensor and its very easy if its the front. Please help! I want to fix my car!

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**Author:** ![oldtimer-11](https://avatars.discourse-cdn.com/v4/letter/o/e79b87/32.png) [@oldtimer-11](https://community.cartalk.com/u/oldtimer-11)\
**Post date:** [January 10, 2010, 3:17am UTC](https://community.cartalk.com/t/help/42186/2 "2010-01-10T03:17:11Z")

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Does your car have a 4 or a 6 ?

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<div class="post-metadata">

**Author:** ![Nahima](https://avatars.discourse-cdn.com/v4/letter/n/eb9ed0/32.png) [@Nahima](https://community.cartalk.com/u/Nahima)\
**Post date:** [January 10, 2010, 3:49am UTC](https://community.cartalk.com/t/help/42186/3 "2010-01-10T03:49:11Z")

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its a 6.

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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:** [January 10, 2010, 4:06am UTC](https://community.cartalk.com/t/help/42186/4 "2010-01-10T04:06:29Z")

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Have you tried simply resetting the light? This “fault” might just disappear into thin air…

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<div class="post-metadata">

**Author:** ![Nahima](https://avatars.discourse-cdn.com/v4/letter/n/eb9ed0/32.png) [@Nahima](https://community.cartalk.com/u/Nahima)\
**Post date:** [January 10, 2010, 4:15am UTC](https://community.cartalk.com/t/help/42186/5 "2010-01-10T04:15:25Z")

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Do you think its worth 75 bucks to have someone look at it atleast?