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Hi, my car acts wierd after 40 to 50 mins driving, it drives fine first around 40 mins, but then Check brakes appears and ready start blinking and beeping, car stops it self. push gas dosent move. if I push break pedal, it makes griding notice while stopped. I have to turn it off and start it again, will drive fine for next around 30 seconds then it does it again. if I leave the car off for sometime around 1 hour it will drive another around 40 mins fine. I went to friend of mine he pulled code C1237 pressure Sensor signal . so question is it HPU? and if get used one and I can replace it or it has to be programmed? Where this pressure sensor located? other then that car drives fine. Thank you for your help.
 

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Your K5 Optima Vendor
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Hello there, welcome to the Optima Forums!

Sorry to hear about the issue that you are experiencing with your hybrid Optima.

Unfortunately, I am not too familiar with the issue that you are experiencing.

Hopefully, another member of the forum can assist you on this one.

-David
 

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Is your brake fluid at the correct level? Has it been changed since you purchased car? I would check those first. If you need to order an OEM part you can use the website parts.com.
 
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