I just bought a 2006 Tacoma with P265/65 R17 110S tires. Both the manual and the inside door sticker indicate that the optimal pressure is 29 psi. Yesterday the air pressure indicator on my dash lit up indicating that one of my tires is low. I checked them and none was below 29 psi. I filled them up to 32 psi and the indicator is still lit. I is the indicator malfunctioning or should I add more air?????