Q

uestion:

My mother's 2011 Honda CR-V has 13,000 miles and original tires. She got back home after two months away, and her tire warning light came on. The tire says 44 pounds per square inch; the door sticker says 30.

I called the dealer, which said to go by the sticker psi, but the tires look low. The Bridgestone tire manual that came with the vehicle says to use the door sticker psi.

Why is there such a discrepancy between the recommended psi level on the tire vs. the door sticker, and is it correct to use the door-sticker psi level? The tires sure look low. Also, I set all tires at 30 psi and the dash light is still on.

The dealer said it might take a little driving around for the light to go out unless it needs to be reset, which they would have to do at a cost. Could my car code analyzer (old cheap one) reset this light?

Answer: There is no discrepancy between the two different tire-pressure specifications. Each is for a different purpose. The 44 psi shown on the tire sidewall is the pressure at which the tire will safely support its maximum load rating. The carmaker's recommended tire pressure for optimum fuel mileage and tire wear is shown on the vehicle's door jamb, in this case 30 psi.

Is there a question of safety with the two different pressures? No. The tire is absolutely safe at its 44 psi max inflation pressure, but the car will ride a bit firmly and the center of the tread will wear considerably faster.

The correct cold tire pressures for every vehicle are posted by the carmaker somewhere on the vehicle - the driver's door jamb, inside the fuel filler cap, or on the inside of the glove-box door.

You didn't say whether both the tire-pressure monitoring system light and the "low tire pressure" warning are on. If it is the light only, a modern scan tool may pinpoint a problem with the TPMS control module. If the "low tire pressure" symbol is on, confirm proper tire pressures and drive the vehicle for several minutes at speeds above 28 m.p.h. to allow the pressure sensor to transmit its signal to the control module.

Q: My wife owns a 2004 Toyota Sienna with 102,000 miles on it. Eight months ago, she put on the parking brake and when she released it, the parking brake light would not go off. It's been on ever since. The local Toyota dealer, a Honda agency, and a local independent auto-repair shop have not been able to fix it.

A: Hopefully, one or more of the service personnel have eliminated the likely cause of the parking brake light staying on as she drives the vehicle: the pedal-applied parking brake mechanism has not fully released; a stuck/binding parking brake cable or shoe, or low fluid level in the brake master cylinder reservoir.

Two other possibilities: the brake warning light switch itself or a problem with the ABS.

Q: I have just purchased a 2004 Acura TL with 93,000 miles on it. Beautiful car, but one problem is a very loud power-steering pump when cold. Is this common, and would a little Sea Foam help?

A: A few ounces of Sea Foam Trans Tune will help clean and condition the power-steering fluid. My ALLDATA database pulled up Acura TSB 07-060 from 2009 that identifies this cold-start characteristic as being generated by aerated fluid caused by air getting past the inlet O-ring. A new O-ring might eliminate the noise.