ScanGauge
Used it on my 2003 Toyota Matrix. Very helpful when the check engine light came on - as well as giving loads of other readings. The codes are easily found on the Internet. It also allows you to clear the code, which I did with one particular sensor my mechanic told me to ignore.
o ring
on the connector …replaceable.
push connector on valve clamp lever pin into valve pin
tire psi will be 65 pounds now pumped to 67 pounds
push air bleed lever open n watch the digital readout count down to 65.02 psi
66.99 66.98 66.97 …
n manually or automatically shut off the bleed at 65.02
Cooler weather
I don’t have them on my car, thank heavens, but my daughter has noticed that her light comes on once the ambient air temp gets cold and the pressure in the tire is slightly lower.
Owners manual.
All of these issues are usually referenced in the owners manual.
hm, now I’m wondering
if you have an ECU tuner, whether you can just turn the light off.
some have to be re-set
– Last Updated: Oct-28-16 11:27 AM EST –
I found out after weeks of frustration the first year I had my new Mazda CX5 that once the low tire pressure light comes on it doesn't go out automatically once you've restored the air levels. The dealer told me it has to be manually re-set. How annoying. Just another dumb light to uselessly nag me to do things I tend to on a routine basis anyway, like the signal on the cluster in my old Hyundai that "told" me when to shift gears (duh.)
This is why I keep a roll of electrical tape in the glove box, to cover superfluous idiot lights.
I guess I draw the line
at whether I can reset a light or not. My car has a maintenance light that comes on for oil changes (based on distance) that also shows a code for any other regular maintenance that’s due. The manual provides directions to reset it, so it’s a convenience rather than a nuisance.
Also just realized I can program my door locks about 10 different ways, which is good since I’ve been griping about the current setup for awhile now…
It doesn’t work on the TPMS
– Last Updated: Oct-28-16 3:23 PM EST –
The TPMS requires a separate scanner, the cheapest of which that I was able to find is over $100. The Scangauge is great for checking OBD-II codes, however.
It’s not likely…
…but you can try. The TPMS system is not typically part of the ECU.
Meiner makes nice guages…
– Last Updated: Oct-28-16 3:41 PM EST –
Oops, make that "Meiser".
They are highly regarded for their quality, but are reasonably priced. I don't have one for my car, but I have them in a couple of pressure ranges for my bikes (they have Presta valves, not Schrader like a car).
www.ghmeiser.com/
True…
…but how many car owners actually read the manual? 
That probably means…
…that she’s running them too low to begin with. The sensors are set to several pounds below the recommended tire pressure on the sticker inside of the driver’s door, which are typically on the low side of optimal, as least for the front tires of a front-drive car. If the tires are properly inflated, a change of even 40-60 degrees should not trip the sensors.
Check your manual
Unless your dealer is doing the resets for free, I wouldn’t take his word for it.
Correcting the low pressure situation is supposed to turn off the light, but it may take several start/stop cycles before the light goes out. If you drive it around for a few days and the light is still on, it will have to be reset.
The guage I have…
…is identical to this one:
https://m.summitracing.com/parts/sum-900006
…except that it’s at least 20 years old, possibly more than 30. I think I paid more for it back then, but it’s been really durable. I wonder if it’s still made in the same country and to the same standards these days.
TPMS recalibrate button
is under the steering wheel on my Fit, so it’s quite easy to do: push the button for two seconds, light blinks, then goes off.
What I haven’t figured out is how to reprogram the door lock so I have more than 30 seconds to get in the car before it locks me out.
same here
reset button is on the dash.
I actually like the maintenance light reset being a bit fussy, it keeps me from just resetting it quickly and skipping maintenance. I usually do it while sitting in the oil change bay.
on leaving vehicle
– Last Updated: Oct-29-16 2:30 PM EST –
hold keys in hand before face n squeeze keys.
before closing the door.
do that on leaving vehicle, tape a warning sign on dash.
there's a thin Velcro pouch for hiding extra keys
my van's cargo doors went thru a lockout cycle last week .....?
on the Honda, you are not alone
http://www.google.com/#q=programming+honda+fit+door+locks
I just might order one or two of them
Their product description seems appropriate to this discussion, when they say their product line is “a standout in an often-unreliable field.”
2006 RAV4
Pushing 172,000 miles and 9-10 years on my RAV4. Last year, upon seeing the tire pressure monitoring sensor (TPMS) light come on with all 5 tires with proper pressures, I took my car to Costco. $45 parts plus $15 install and light reset. Learned the sensors have individual batteries and should last about 5 years or so. Not long after, another sensor battery failed and triggered the light again. Tire Kingdom wanted over $185 for diagnostics, install and reset! The dealership even more! Just the other day I replaced two more original TPMS at Costco. Only the spare tire remains original. Furthermore, I was in-and-out in 1 1/2 hours. They do great work.
keep it clean
– Last Updated: Oct-30-16 1:28 PM EST –
http://www.walmart.com/ip/Sterilite-2.7-qt-Modular-Latch-Box-Teal-Sachet/49527435
Grease and oil, esp older lubricants, absolve over time. Lubes dry out.
Test your gauge with a digital applying a correction if necessary.
let us know what you found