# Sensors

**URL:** <https://community.cartalk.com/t/sensors/35383>\
**Category:** Maintenance/Repairs\
**Tags:** nissan, sentra\
**Created:** [August 21, 2009, 7:47pm UTC](https://community.cartalk.com/t/sensors/35383 "2009-08-21T19:47:13Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![cafolla](https://avatars.discourse-cdn.com/v4/letter/c/a9adbd/32.png) [@cafolla](https://community.cartalk.com/u/cafolla)\
**Post date:** [August 21, 2009, 7:47pm UTC](https://community.cartalk.com/t/sensors/35383/1 "2009-08-21T19:47:13Z")

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I have a 2001 Sentra - back in 2007 the head gasket needed to be replaced along with the theromosat & radiator - needless to say the repairs total near $2,000. However, the sensors were fine then but now the “Check Engine Light:” is always on and 4 sensors need to be replaced. Estimate: $240/each with labor  
  
 totalling $1,000. If I let this go the Catalyltic converter will eventually need to be replaced also. (which working fine now)  
  
 Does this sound correct? Should I sell the car?  
  
 Help and thanks!

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**Author:** ![hellokit](https://avatars.discourse-cdn.com/v4/letter/h/6a8cbe/32.png) [@hellokit](https://community.cartalk.com/u/hellokit)\
**Post date:** [August 21, 2009, 7:54pm UTC](https://community.cartalk.com/t/sensors/35383/2 "2009-08-21T19:54:56Z")

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You need a mechanic/shop who can troubleshoot a problem; not one who is, only, proficient at changing parts. Ask around.  
Let us see the trouble codes.

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**Author:** ![tardis](https://avatars.discourse-cdn.com/v4/letter/t/f0a364/32.png) [@tardis](https://community.cartalk.com/u/tardis)\
**Post date:** [August 21, 2009, 7:56pm UTC](https://community.cartalk.com/t/sensors/35383/3 "2009-08-21T19:56:23Z")

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How do you know that the sensors are at fault? It seems likely that something is wrong and four of your sensors are trying to tell you so.

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**Author:** ![jtsanders](https://avatars.discourse-cdn.com/v4/letter/j/c2a13f/32.png) [@jtsanders](https://community.cartalk.com/u/jtsanders)\
**Post date:** [August 21, 2009, 8:51pm UTC](https://community.cartalk.com/t/sensors/35383/4 "2009-08-21T20:51:32Z")

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Tell us what the OBD-II codes are. How many miles are on the car? You might also try another shop or two to see what they think.