TPMS (Tire Pressure Monitor Sensor). Replace battery or unit?
#1
Driver School Candidate
Thread Starter
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So these TPMS can get quite expensive, cheapest for a set I found was $50. I've seen on youtube where you can replace the CR2450 battery with solder tabs. Is it almost always the battery that goes out or should I replace the whole unit? I bought the car with 74K miles and it has always been on. Also, would a OBD2 scan be able to tell me exactly which sensor is out?
#2
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Hi,
It is most probable the battery. And very likely soon all 4 sensors. Changing the battery can be done, I've changed 4 batteries to my sensors and they are all fine now. Before that I bought some cheap sensors to replace the original ones, but they were unreliable: most of the time the car was able to read them right, but sometimes it failed (causing 'Check System' messages on dash).
Using the TechStream, you can find out which sensors are bad. But it only tells you the ID of the sensor, not the location. The same ID is printed on the sensor. A generic OBD2 scanner probably does not tell any details... but the tire shops have handheld scanners to check/read the sensors even inside tires.
BR.Sami
It is most probable the battery. And very likely soon all 4 sensors. Changing the battery can be done, I've changed 4 batteries to my sensors and they are all fine now. Before that I bought some cheap sensors to replace the original ones, but they were unreliable: most of the time the car was able to read them right, but sometimes it failed (causing 'Check System' messages on dash).
Using the TechStream, you can find out which sensors are bad. But it only tells you the ID of the sensor, not the location. The same ID is printed on the sensor. A generic OBD2 scanner probably does not tell any details... but the tire shops have handheld scanners to check/read the sensors even inside tires.
BR.Sami
#6
Driver School Candidate
Thread Starter
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Thanks. I'll replace the battery since it'll save me lots. My tire pressures are always good but just my OCD of seeing a yellow indicator light on dash bothers me haha
#7
Lexus Test Driver
iTrader: (1)
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If you do not properly swap out the battery then you will have to pay to remove the sensors and redo everything. Unless if you have a tire bead breaker, if you do then you can easily swap them anytime at home. But to pay a shop $15-25 bucks per wheel, thats a risk. Ive opened tpms sensors before, that silicone is tough its time consuming.
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