I recently bought new wheels and tires from AmericanMuscle and opted not to buy new TPMS sensors because they were back ordered. I planned to have a tire shop swap over my old ones but I've been driving the car for several days and the dash still says "Tire Pressure OK". Did AmericanMuscle accidentally throw sensors into the tires or does it take a long time for the computer to recognize that they're missing?

 

Don't know what is going on there. If they did put sensors in, you should have had to train them to the car with a TPMS training tool.

 

Are you parking the car close to where your other wheels are? That may be the reason why the low air pressure light hasn't come on yet. And no it won't throw a CEL but eventually you will have the low tire pressure light/alert come on whenever you start your car and will have to hit the reset button. I don't use TPMS valves at all in my car.

And FYI the tool is not necessary if you use OEM TPMS valves. They are sell learning.

 

Not parking closer than about 15-20 feet from the old tires. Can't imagine they transmit that far. Hm, guess I'll keep waiting for a warning light then. Thanks guys.

 

We can definitely look into the order for you and see if TPMS sensors were installed. It also takes a few miles for the light to be tripped if there is no sensors. How many miles have you driven the car?

-Dan

 

Probably about 50-75 miles.

 

In my 2011 the TPMS i got with my rims that i bought must have been not factory ford ones because everywhere i take it took they can't sync them so i get a tire pressure sensor fault all the time, but its not a check engine light.

this is the light i get

http://www.americanmuscle.com/unders...tang-tpms.html

 

If you drive less than 15 miles per ignition cycle and park close to your OE rims/tires, the system won't trip a fault against the TPMS system. I have a set of aftermarket wheels/tires with no TPMS, and that's what happened.

As soon as I drive more than 15 miles without keying off I get the TPMS light on and "Service Tire Pressure Monitor" message on the dash.

 

What is considered "close" to the OE wheels?

 

It varries application to application, but ~15-20 ft should be enough for the RKE module to pick up periodic transmission from stationary wheels.