Do the Tire pressure sensors on cars give an accurate reading of tire pressure?

Question

I just checked all four tires with a gauge, and inflated to 36psi, but when I drove the car a few minutes later, the sensors read 33psi. I am wondering which one is accurate and which one is off. I used a cheap pencil style tire gauge, but that is all I have ever used. anyway, I know it is not that much of a difference, but tires are not cheap, and i want to get the best mileage i can out of them. I was wondering if anyone else has tested the pressure. My car is a 1999 Corvette.

dodge man · Accepted Answer

i own a repair shop,and i have tested the sensors on a few different cars,and there accurate to with in 1-3 pounds and that's pretty good considering the temperature in the tires changes so much,and with it changes the air pressure also,but as long as your with in 3 pounds your fine on air pressure,good luck i hope this help,s.

Bikerbutt · Answer

On our car, the sensors were quite accurate. When I did have to add air to a tire, it seems like I also had to push a red reset button in the fuse panel. This was on a 2000 Buick Regal....

krunchnik · Answer

most of the time the pressure sensors are very accurate,pencil gauges if they are the inexpensive types can be 2-8lbs out of calibration.

deltech · Answer

to make it simple. the TPM has to relearn the tire pressures and the positions anytime a tire`s pressure is changed .Best advise take it to chevy dealer and let them synchronize the thing !

doomsday_propaganda · Answer

Depends on the product brand, why don't you read the manual?

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Do the Tire pressure sensors on cars give an accurate reading of tire pressure?

5 Answers