# Nissan ECU Trouble Codes - Reading, resetting, etc...

**URL:** <https://forums.speedlife.net/t/nissan-ecu-trouble-codes-reading-resetting-etc/80753>\
**Category:** SON240sx Automotive\
**Created:** [March 20, 2004, 12:38pm UTC](https://forums.speedlife.net/t/nissan-ecu-trouble-codes-reading-resetting-etc/80753 "2004-03-20T12:38:53Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![suds240](https://avatars.discourse-cdn.com/v4/letter/s/ecccb3/32.png) [@suds240](https://forums.speedlife.net/u/suds240)\
**Post date:** [March 20, 2004, 12:38pm UTC](https://forums.speedlife.net/t/nissan-ecu-trouble-codes-reading-resetting-etc/80753/1 "2004-03-20T12:38:53Z")

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Nice post Jesse. Question though, if our check engine light is **not** on, can this test still be performed and produce any results?

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**Author:** ![Sm0ke](https://avatars.discourse-cdn.com/v4/letter/s/ce7236/32.png) [@Sm0ke](https://forums.speedlife.net/u/Sm0ke)\
**Post date:** [March 20, 2004, 11:18pm UTC](https://forums.speedlife.net/t/nissan-ecu-trouble-codes-reading-resetting-etc/80753/2 "2004-03-20T23:18:20Z")

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I know OBD II stores some codes without trigguring the check engine light, but I doubt OBD I does it. Maybe in some cars, but definately not all.

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**Author:** ![suds240](https://avatars.discourse-cdn.com/v4/letter/s/ecccb3/32.png) [@suds240](https://forums.speedlife.net/u/suds240)\
**Post date:** [March 21, 2004, 11:06am UTC](https://forums.speedlife.net/t/nissan-ecu-trouble-codes-reading-resetting-etc/80753/3 "2004-03-21T11:06:50Z")

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> [@FrEaK](#):
>
> [quote=suds240]Nice post Jesse. Question though, if our check engine light is **not** on, can this test still be performed and produce any results?

Yessir :)[/quote]

Any examples of what kind of things that could come up from performing a check when the check engine light is not on, and no blatant evidence exists to lead me to believe that there is something wrong? I’m just trying to get a sense of whether it would be worthwhile for me to check this out, even though nothing ‘seems’ wrong. I could be living with a false sense of security. Then again, I might not want to know if something big is wrong :? .