The Reset Procedure for the Tire Pressure Monitor on a 2008 Subaru Outback
- 1). Allow the Outback to set for at least 1 hour, if you recently drove more than 1 mile. This allows the tires to cool off, as heat causes the pressure in the tires to increase.
- 2). Check the size of your Outback’s tires by reading the numbers on the sidewall. Compare your Outback’s tire size with those in the chart below to obtain its correct tire-pressure reading.
P205/55R16: 32 psi front and 30 psi rear
P225/60R16: 32 psi front and 30 psi rear
P205/50R17: 33 psi front and 32 psi rear
P215/45R17: 35 psi front and 33 psi rear
P225/55R17: 32 psi front and 30 psi rear
P215/45R18: 33 psi front and 32 psi rear
- 3). Unscrew the caps from all four valve stems — the rubber stems protruding from the rims — and place them in a secure location.
- 4). Press the tire-pressure gauge firmly onto the end of the valve stem and read the pressure rating on the tire pressure gauge. Compare this reading with the correct tire pressure for your Outback’s tires. Any tire below the recommended pressure by 2 or more psi requires more air.
- 5). Park the vehicle near a compressed air source with a tire inflation chuck.
- 6). Press the tire inflation chuck onto the end of the valve stem, just like you did with the pressure gauge, to start the flow of air into the tire. Estimate the amount of time to add air to the tire using the rough formula that the tire pressure increases 1 psi every 3 to 5 seconds you hold the chuck on the valve stem.
- 7). Pull the tire inflation chuck from the valve stem once you estimate the tire has reached its correct pressure. Check the air pressure in the tire by following Step 4.
- 8). Repeat Steps 6 and 7 to adjust the air pressure on any other tires that require air.
- 9). Drive the Outback to a open road with little traffic and accelerate to a speed of at least 20 mph. Observe as the tire-pressure light — located on the bottom right of the instrument cluster — turns off. If the light does not turn off, there is likely a problem with the TPMS and will require inspection by a professional.