# Check Engine Light?

**URL:** <https://forums.speedlife.net/t/check-engine-light/106102>\
**Category:** SON240sx Automotive\
**Created:** [April 30, 2007, 11:54am UTC](https://forums.speedlife.net/t/check-engine-light/106102 "2007-04-30T11:54:06Z")\
**Posts on this page:** 1\
**Showing post:** 3

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**Author:** ![s1495](https://avatars.discourse-cdn.com/v4/letter/s/b2d939/32.png) [@s1495](https://forums.speedlife.net/u/s1495)\
**Post date:** [April 30, 2007, 10:13pm UTC](https://forums.speedlife.net/t/check-engine-light/106102/3 "2007-04-30T22:13:48Z")

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> [@circuit city customer service](https://forums.speedlife.net/t/circuit-city-customer-service/12373/4):
>
> It just went off after doing a compression test. I put the plugs back in, torque to 15 and than put the wires back on. I than re-attached the two harasses. Does anyone have an idea…oh ya I tried to un hook the battery and re connect it, no difference.
> 
> On a good note my compression showed  
> 185-175psi dry and 197-185psi wet

Disconnecting the battery won’t do much - to reset the ecu - unplug it and rotate the small knob on the back of ecu to diagnostic mode then back. But first check the codes - it could have had enough time to detect maf disconnect (my guess is those are 2 harnesses you were talking about – IAT sensor and MAF).

Check your codes.

Jack

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