My Husband and Father in Law changed out my transmission 4 months ago. The check engine light came on as soon as they got it back together. My registration is up, and I can't get it registered because of these codes. How can I fix this?
I looked up the codes.
p1193 is the intake air temperature sensor, which is usually located somewhere in the big black tube that runs from the air filter assembly to the throttle body, replace it.
p1684 all this one is that the battery has been disconnected within the last 50 starts.
p0743 is the transmission torque converter clutch switch, open or short in the circuit, check and see if the wires aren't broken anywhere, and that it didn't come unplugged.Have to crawl under car for that one. Hope this helps.
On some cars, disconnecting the battery will cause a code to be stored in the computor. The engine light should reset it self, and in some cases it don't, if it doesn't, you can do it yourself, disconnect the negative battery terminal for about 10 to 15 seconds, and reconnect, but if the car is equipped with the built in anti theft in the radio, you better get the code or it will never turn back on, and you will have to reset the stations. AS for the clutch switch, it can trigger the light, but I can't see where it has anything to do with emissions. If there is no wire problems, the switch might have to be replaced.
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First of all, Thank you for your help! Can the battery disconnection trigger the check engine light? I will replace air temp sensor tonight. Will that code reset all by itself, and my check engine light go off, or will it need to be reset? Also, if I can't find a wire issue on the transmission torque converter clutch switch, can that trouble code trigger the check engine light and cause me not to get my car thru emissions? Does that even have anything to do with emissions?
I don't know what state you are in, but in PA a P0743 code WILL cause you to fail emissions inspection---even though it's not really an emissions problem. I talked to a PennDOT "expert" (not just a call center person) about it. He was understanding, and complained himself about Dodge junk that he owns, but the laws/rules are the laws and it won't pass the inspection. I have a 99 Caravan with the same code (and probably the same engine and/or tranny as your Neon); in PA, if you spend $150 in "repairs" trying to fix the code, they'll give you a waiver for one year....but you'll need to do it every year. Some states you need to spend $300, or in IL, $450!
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