2008 Volvo S40 Owner's Manual - Page 171

pressure, please refer to the tables beginning on page 172. The tire pressure warning light will not identify which tire is under-inflated. Be sure to check all four tires. A certain amount of air seepage from the tires occurs naturally and tire pressure fluctuates with seasonal changes in temperature. Always check tire pressure regularly. Erasing warning messages When a low tire pressure warning message has been displayed, and the tire pressure warning light has come on: 1. Use a tire pressure gauge to check the inflation pressure of all four tires. 2. Re-inflate the tire(s) to the correct pressure (consult the tire pressure placard or the tables beginning on page 172). 3. In certain cases, it may be necessary to drive the vehicle for several minutes at a speed of 20 mph (30 km/h) or faster. This will erase the warning text and the warning light will go out. WARNING Incorrect inflation pressure could lead to tire failure, resulting in a loss of control of the vehicle. Changing wheels with TPMS Please note the following when changing or replacing the factory installed TPMS wheels/tires on the vehicle: Only the factory-mounted wheels are equipped with TPMS sensors in the valves. If the vehicle is equipped with a temporary spare tire, this tire does not have a TPMS sensor. If wheels without TPMS sensors are mounted on the vehicle, TIRE PRESS SYST SERVICE REQUIRED will be displayed each time the vehicle is driven above 25 mph (40 km/h) for 10 minutes or more. Once TPMS sensors are properly installed, the warning message should not reappear. If the message is still displayed, drive the vehicle for several minutes at a speed of 20 mph (30 km/h) or faster to erase the message. Volvo recommends that TPMS sensors be fitted on all wheels used on the vehicle. Volvo does not recommend moving sensors back and forth between sets of wheels. NOTE If you change to tires with a different recommended inflation pressure, the TPMS system must be recalibrated to these tires. This must be done by a trained and qualified Volvo service technician. If a tire is changed, or if the TPMS sensor is moved to another wheel, the sensor's seal, nut, and valve core should be replaced. When installing TPMS sensors, the vehicle must be parked for at least 15 minutes with the ignition off. if the vehicle is driven within 15 minutes, a TPMS error message will be displayed. CAUTION When inflating tires with TPMS valves, press the pump's mouthpiece straight onto the valve to help avoid bending or otherwise damaging the valve. 189 07 Wheels and tires This page left intentionally blank.