replacement of vehicle speed sensor - Kia Forum
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#1 (permalink) Old 06-03-2007, 08:40 AM
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Default replacement of vehicle speed sensor

I've had the same problem as a lot of people which is the o/d light blinking and check engine light on. For a 1999 kia sephia is there more than one vehicle speed sensor, I thought I read that there is an input and an output but I'm not sure. If I am replacing this to try and fix this problem just need to know where on the transmission it is located, maybe how to replace it. I'm in Georgia trying to get my tag and trying not to spend a bunch of money if it is something I can do myself..


Thanks...
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#2 (permalink) Old 06-03-2007, 08:58 AM
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i'm havin same exact problem with my 99 kia sephia, is ur speedometer jumping also? and when you got the codes read did give off 5 codes 4 of them being a misfire on the each corresponding cylinder? I've had this problem for a while and i just got around to orderin the part. It arrives later this week.... this would help me a lot also.....
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#3 (permalink) Old 06-03-2007, 09:11 AM
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if you have a misfire its not the speed sensor... Its either coils, or wires or both...

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#4 (permalink) Old 06-04-2007, 09:20 AM
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I had 3 codes come up. P 0302 cylinder misfire (replaced coils, wires, plugs) p1624 and p0734 the 0734 is gear 4 incorrect ratio. This is the one that I believe I need to replace the speed sensor to solve. Only problem that I have is I do not know the difficulty involved in finding and changing this sensor out. Any help would be appreciated. Thanks
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#5 (permalink) Old 06-04-2007, 09:24 AM
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well if you replaced the wires and coils why would you still have the misfire code? It related to the coils, plugs, wires. What did you gap the plugs at?

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#6 (permalink) Old 06-04-2007, 09:25 AM
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No my speedometer has not worked since I got the car. I bought it at an auction. I knew it had a few problems but I am hoping that it will be a reliable car after I finish doing this and getting my tag. To correct the misfire replace the plugs, wires AND the coil packs. This is very easy to do. Take the top off of the top of the engine and you will see everything right there. Just a few screws to remove and take out the old ones and put the new ones in and you are in business. What the speed sensor has to do with is your transmission is getting incorrect information and not running properly. This causes the dash light to illuminate and also for some reason causes the O/D light to flash....Can't get my tag in Georgia with dash light on.
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#7 (permalink) Old 06-04-2007, 09:30 AM
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Spade 118 is the one still having the misfire problem. That part I have corrected. The last and remaining thing for me to do is replace the speed sensor. I have another car so I have been driving that while I did my research. I took it to a few mechanics and they started talking big money. In the course of my research I discovered that the speed sensor is the most probable cause for the gear 4 ratio code to come up. Only problem that I have is that I do not know exact location for this sensor or the difficulty involved in changing it out. The part new is only $44.00 so I figure if I can do it myself and that solves my problem great if not, I'll trade the car in when I get ready to get another. Any help on the location of the speed sensor and difficulty involved changing it would be greatly appreciated...thanks...Adam
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#8 (permalink) Old 06-04-2007, 11:39 AM
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find it here
www.kiatechinfo.com

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#9 (permalink) Old 06-06-2007, 05:31 PM
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ok i just fixed the speed sensor on my 99 kia sephia ls! ok ummmm.... here's wat i did... i removed the air filter assembly just the the large rubber hose between the throttle body and the actual air filter. It's held by a those screw clamps on each end. It's #4 in pic below!



After that's removed its easier to get to the actual sensor. it's left of the trannmission dipstick in the rear of the tranny itself. It's right above the catylitic converter if i'm not mistaken.

You need a 10mm socket wrench, and keep in mind back there is kinda tight. i remove the negative battery cable to reset the OBD and also to be on the safe side when i deal with any electrical components

Remove the clip attached the speed sensor. Remove the 10mm bolt and pull upward to remove the sensor. Then you should compare them to the one you have to see if it's the same fitting one.

this is a pic for an Manual Trans Speed sensor



Auto Speed sensor comparison new(right) old ( left)


notice the spacing between the red spinner thing, the washer and the housing itself



Try not to work around heavy debris area b/c the this sensor is sits in tranny fluid and you dont want any unwanted particles inside your Tranny.

Replace the sensor with the new one, mines was a little tight but it fit. try to place it in as far as possible in and then the screw will take care of the rest. Once its in screw it back down, attach the clip, replace the air filter assembly. Hope this helps!

Last edited by Spade_118; 06-08-2007 at 02:27 PM.
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#10 (permalink) Old 06-20-2007, 10:46 AM
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Spade, that is really helpful information !

I have a question. Is there a trick to removing the clip? Also, by clip do you mean the plastic thing where the wires go? I'm having trouble pulling the cable connector (clip?) out.

Thanks!
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