# Mystery Warning Light **URL:** \ **Category:** SON240sx Automotive\ **Created:** [May 18, 2004, 3:53pm UTC](https://forums.speedlife.net/t/mystery-warning-light/80999 "2004-05-18T15:53:14Z")\ **Posts on this page:** 10\ **Page:** 1
**Author:** ![SHIFT\_KA24DET](https://avatars.discourse-cdn.com/v4/letter/s/b9bd4f/32.png) [@SHIFT\_KA24DET](https://forums.speedlife.net/u/SHIFT_KA24DET)\ **Post date:** [May 18, 2004, 3:53pm UTC](https://forums.speedlife.net/t/mystery-warning-light/80999/1 "2004-05-18T15:53:14Z")
![http://membersdb.son240sx.ca/images/membersdb/1009_picture_2192edit.jpg](http://membersdb.son240sx.ca/images/membersdb/1009_picture_2192edit.jpg) ---
**Author:** ![dnash](https://avatars.discourse-cdn.com/v4/letter/d/f6c823/32.png) [@dnash](https://forums.speedlife.net/u/dnash)\ **Post date:** [May 18, 2004, 5:00pm UTC](https://forums.speedlife.net/t/mystery-warning-light/80999/2 "2004-05-18T17:00:41Z")
I looked thorugh the FSM and couldn’t find anything. The drawing looks sort of like a catalytic converter. Maybe it warns if your cat is overheating…? ---
**Author:** ![SHIFT\_KA24DET](https://avatars.discourse-cdn.com/v4/letter/s/b9bd4f/32.png) [@SHIFT\_KA24DET](https://forums.speedlife.net/u/SHIFT_KA24DET)\ **Post date:** [May 18, 2004, 5:18pm UTC](https://forums.speedlife.net/t/mystery-warning-light/80999/3 "2004-05-18T17:18:55Z")
> [@AppleSauce](#): > > Cat temp warning light, jdm =D\> BINGFREEKINGO 😃 ---
**Author:** ![syd\_mysta](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/syd_mysta/32/5488_2.png) [@syd\_mysta](https://forums.speedlife.net/u/syd_mysta)\ **Post date:** [May 20, 2004, 7:00am UTC](https://forums.speedlife.net/t/mystery-warning-light/80999/4 "2004-05-20T07:00:54Z")
Weird that’s the same local of my wiper fluid light, which is currently on lol. ---
**Author:** ![Jayamashey](https://avatars.discourse-cdn.com/v4/letter/j/2bfe46/32.png) [@Jayamashey](https://forums.speedlife.net/u/Jayamashey)\ **Post date:** [July 21, 2004, 6:28am UTC](https://forums.speedlife.net/t/mystery-warning-light/80999/5 "2004-07-21T06:28:07Z")
Just noticed this post. Took me forever to figure it out when I got it with my car. Orginally thought it was the windsheild washer fluid, but its an exhaust temp warning light for Turbo applications. Essentially - over heating turbo warning light for SR20DET. A good warning to have. I’ve go mine hooked up but haven’t seen the warning yet 😉 ---
**Author:** ![SHIFT\_KA24DET](https://avatars.discourse-cdn.com/v4/letter/s/b9bd4f/32.png) [@SHIFT\_KA24DET](https://forums.speedlife.net/u/SHIFT_KA24DET)\ **Post date:** [July 21, 2004, 7:10am UTC](https://forums.speedlife.net/t/mystery-warning-light/80999/6 "2004-07-21T07:10:18Z")
> [@Jayamashey](#): > > Essentially - over heating turbo warning light for SR20DET. A good warning to have. I’ve got mine hooked up but haven’t seen the warning yet 😉 Hooked up to what sensor? ---
**Author:** ![Jayamashey](https://avatars.discourse-cdn.com/v4/letter/j/2bfe46/32.png) [@Jayamashey](https://forums.speedlife.net/u/Jayamashey)\ **Post date:** [July 21, 2004, 7:32am UTC](https://forums.speedlife.net/t/mystery-warning-light/80999/7 "2004-07-21T07:32:28Z")
The guy that was explaining it all to me didn’t mention the sensor location. He was just telling me about it and why it was used. I neglected to ask about the sensor. Next time I see him I will ask. ---
**Author:** ![SHIFT\_KA24DET](https://avatars.discourse-cdn.com/v4/letter/s/b9bd4f/32.png) [@SHIFT\_KA24DET](https://forums.speedlife.net/u/SHIFT_KA24DET)\ **Post date:** [July 21, 2004, 7:59am UTC](https://forums.speedlife.net/t/mystery-warning-light/80999/8 "2004-07-21T07:59:02Z")
The Sensor is located in or before the CAT depending on the year of the vehicle. This sensor will only work if you have used the Stock DP or Stock CAT from a Front Clip. ---
**Author:** ![Jayamashey](https://avatars.discourse-cdn.com/v4/letter/j/2bfe46/32.png) [@Jayamashey](https://forums.speedlife.net/u/Jayamashey)\ **Post date:** [July 21, 2004, 9:02am UTC](https://forums.speedlife.net/t/mystery-warning-light/80999/9 "2004-07-21T09:02:42Z")
My stock DP didn’t have any extra sensors. Don’t know about the cat since I didn’t get it with. But whats the sense of having the sensor in the cat? ---
**Author:** ![mr200](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/mr200/32/5495_2.png) [@mr200](https://forums.speedlife.net/u/mr200)\ **Post date:** [July 21, 2004, 11:57am UTC](https://forums.speedlife.net/t/mystery-warning-light/80999/10 "2004-07-21T11:57:08Z")
Exhaust Gas temps can tell you a lot about the conditions of your motor (air/fuel) But unfortunately most people assume that an EGT probe is an effective tuning tool. For more debunking of “tune with EGT” myths (dial up be forewarned) [EGT Primer 56K stay away](http://www.club-s12.org/board/showthread.php?t=6148/) If you don’t care about WHY … lean makes the temps go up … but detonation makes the temp go down. But if exhaust temps are spiking, it’s a good sign you’re running lean. I wouldn’t be surprised if this sensor somehow wires to the ECU and if cat temps get too high, maybe it goes into limp mode, or just richens up the mix. :dunno: