Second opinion] Changed the battery in my 07 elantra and ...


Second opinion] Changed the battery in my 07 elantra and now the alarm keeps going off when we bought the car there was no key fob Mechanic's Assistant: Have you changed a battery before? In this car no Mechanic's Ass...

Second opinion] Changed the battery in my 07 elantra and now the alarm keeps going off when we bought the car there was no key fob Mechanic's Assistant: Have you changed a battery before? In this car no Mechanic's Assistant: Are you fixing your Elantra yourself? What have you tried so far? Yes it is just a battery and tried to unlock it and get in and the alarm still going off Mechanic's Assistant: Anything else you want the Mechanic to know before I connect you? No ty

Automotive Expert
Howdy from Tennessee, I'm Chris aka Moose. Who am I helping today? I'm glad you've come here to get help. I will do my best to get the answer you are looking for. I help many customers, so sometimes my replies are delayed, I will respond once available. I try to be online at 1-5 pm and 10 pm-5 am every day. Is the alarm (pulsing horn and exterior lights) still going off with the key in the ignition and in the RUN position? Will the car crank and start?

Alarm is going off but when we do get it to stop car Won't start like the alarm is stopping itThe car. Was working fine until we changed the battery
Automotive Expert
Thanks, In the car is there a flashing theft light in the instrument cluster or somewhere on the dash around the steering column?

We don't see one
Automotive Expert
Look under the driver's side of the dash for out-of-place wiring and models that do not appear to be from Hyundai.
Automotive Expert
Since you were not able to reply to the info request I sent. I cannot be as accurate and thorough as I would like in my answer. I hope what I can provide does help. I believe the concern is an aftermarket alarm that needs to be removed and the wires repaired to stop this concern and allow the vehicle to start. Thank you for seeking us for help, I hope I provided what was needed. Press reply if you need to follow up. If you liked my answer please let me know so I can mark your question complete. Moose

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