# CEL on and off?

**URL:** <https://forums.speedlife.net/t/cel-on-and-off/147741>\
**Category:** Canada Nissan Automotive\
**Created:** [August 29, 2007, 8:35am UTC](https://forums.speedlife.net/t/cel-on-and-off/147741 "2007-08-29T08:35:26Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![240DRIFTz](https://avatars.discourse-cdn.com/v4/letter/2/bbe5ce/32.png) [@240DRIFTz](https://forums.speedlife.net/u/240DRIFTz)\
**Post date:** [August 29, 2007, 8:35am UTC](https://forums.speedlife.net/t/cel-on-and-off/147741/1 "2007-08-29T08:35:26Z")

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My CEL seems to be coming off and on randomly…it mostly occurs when i first start the car…then once i start driving the light just shuts off. Checked for codes and found nothing…but i think my o2 sensor is on its last legs…would that cause the light to turn on and off randomly. If i first start the car and it comes on. Sometimes i can pump the brake pedal 3 or 4 times and the light will shut off. Anyone got a clue why it would be doing so or any other ways of diagnosing what the problem is

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**Author:** ![rheddrahgon](https://avatars.discourse-cdn.com/v4/letter/r/df788c/32.png) [@rheddrahgon](https://forums.speedlife.net/u/rheddrahgon)\
**Post date:** [August 29, 2007, 8:41am UTC](https://forums.speedlife.net/t/cel-on-and-off/147741/2 "2007-08-29T08:41:52Z")

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mine did that when i filled up with shell regular. I stopped and used esso regular, light went off in one tank hasnt been on since.

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**Author:** ![240DRIFTz](https://avatars.discourse-cdn.com/v4/letter/2/bbe5ce/32.png) [@240DRIFTz](https://forums.speedlife.net/u/240DRIFTz)\
**Post date:** [August 29, 2007, 9:20am UTC](https://forums.speedlife.net/t/cel-on-and-off/147741/3 "2007-08-29T09:20:50Z")

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I doubt that would be it…ive gotten esso 91 octane on my old motor for a year without the CEL on. theres a 711 with esso gas down the street from my house i always get gas there…have gotten gas at other places aswell and never had my CEL show up

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**Author:** ![rheddrahgon](https://avatars.discourse-cdn.com/v4/letter/r/df788c/32.png) [@rheddrahgon](https://forums.speedlife.net/u/rheddrahgon)\
**Post date:** [August 29, 2007, 11:08am UTC](https://forums.speedlife.net/t/cel-on-and-off/147741/4 "2007-08-29T11:08:57Z")

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then yeah id have to say your sensor is going.