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Hi my name is ***** ***** I will be happy to assist with this today.In some cases I may need more info to assist better.I apologize for any delay.
First make sure they did not leave the old sensors that were removed in the vehicle somewhere.I have seen this done before and it confuses the computer and causes this issue.
If this is o.k. and the only sensors in the vehicle are the ones in the wheels/tires and you have no readings at all the dealer or a repair shop needs to use their tire pressure test tool to see if the new sensors are still sending out a signal.If they are not then the sensors they installed are faulty and need replaced again under parts warranty at no charge to you.
If the sensors are sending out a signal then the tire pressure low pressure module is most likely faulty needing replaced.It is located under the dash on the passenger side.It can fail internally and causes a fault like this here with it needing replaced.You would need to have this tested further to see if for sure it needs replaced but I have had to replace it before for this type of fault here.
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The tire pressure module is what monitors the tire pressures.If a tire becomes low then the module turns on the warning light/message you see on the dash.I show a cost of around $500 for this module and a half hour labor to have replaced.
Any shop or garage that has a tire pressure test tool can usually test this for you and replace if needed.Below are the only images I show on its location.
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