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The tire pressure monitor constantly lights up on my 2005 Toyota Corolla. And just as frequently I check and adjust the pressure on all four tires. The pattern of low/adequate pressure is random - sometimes the tires will be fine, sometimes one or more will be off by 1-4 pounds. The history is this: I don't use the car that much. When I had my 3,500 mile checkup at the dealer, I had to go back twice (as I was driving away) because this warning light came on - they explained that it was due to not using a digital tire pressure gauge to get all four tires the same. The second time I went to the dealer for my 7,500 mile checkup, they rotated my tires and didn't notice a screw that was in one of them! So I went to a chain auto repair place which removed the screw and plugged the hole. Today, the warning light will come on, predictably if I do about 10 minutes of highway driving. Further, the low pressure does not always occur on that fixed-up tire. Finally, my question is this: do I go to the chain or dealer to get this checked out? In my gut, I actually trust the chain auto repair place (they've always treated me nicely when I serviced a 1987 Plymouth Sundance there) over the Toyota dealer. I just don't know if the dealer will have an edge in locating a problem with the tire pressure monitoring system or if a reputable chain place will be equally informed.

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Patty Streeter,  at We recommend having your service, maintenance and repairs done at our AskPatty certified dealerships. you can use the dealer search to locate one at or find an ASE Blue Seal certified service center: You can locate one here:

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