All listed data and/or calculations are for informational purposes only. TirePressure.com does not warrant or make any representations regarding the accuracy of or the results of the use of this information. Always refer to vehicle owner's manual for recommended tire pressure settings. Never overinflate or overload a tire beyond its maximum capabilities listed on sidewall.
What should BMW 840i tire pressure be?
Recommended tire pressure for BMW 840i tires ranges from 32 psi to 42 psi, as set by vehicle manufacturer according to model's original equipment tire size and gross vehicle weight rating (GVWR) to optimize vehicle safety, performance and fuel efficiency.
Where to find recommended tire pressure for BMW 840i?
BMW 840i recommended tire pressure can be found in owner's manual, on a tire placard on the side of driver's door or door jam, on the trunk lid, in the console or on the fuel door. Tire inflation will be listed in psi (pounds per square inch), bar or kPa (kilopascals).
To check BMW 840i tire pressure you will first need to determine its recommended tire pressure for the front and rear tires. Take off tire valve caps and use a tire pressure gauge to check tire inflation in every tire. Adjust BMW 840i tire pressure to its recommended levels. If overinflated, let some air out by pressing down the center plunger in the valve stem. If underinflated, add air with tire inflator. Recheck tire pressure to make sure all tires are properly inflated. Replace the valve stem caps. Make sure to check tire pressure when tires are "cold" and have not been driven for at least 3 hours. Remember that the front and rear tire pressures may differ.
What is proper tire pressure for BMW 840i replacement tires?
If you replace BMW 840i original equipment tires with non-stock tires that have different size or load capacity, new tires may require substantially different inflation pressures. Use our tire pressure calculator to find proper tire inflation when switching to a different tire size.
What is recommended winter tire pressure for BMW 840i?
Tire pressure fluctuates with ambient temperatures. When temperatures drop, BMW 840i tires may lose approximately 1 psi of air pressure for every 10 degree Fahrenheit decrease. During winter BMW 840i tires can be inflated 3 to 5 psi above the recommended tire pressure settings to compensate for lower temperatures. Do not overinflate above the maximum tire inflation pressure value indicated on tire sidewall. Make sure to check tire pressure regularly in the winter to keep tires properly inflated for a safe ride on snow and icy roads.
Is BMW 840i equipped with Tire Pressure Monitoring System (TPMS)?
If your BMW 840i is built after 2007, it is most likely equipped with a Tire Pressure Monitoring System. Check owner's manual to see if your model has TPMS.
Why is BMW 840i tire pressure light on?
If BMW 840i TPMS warning light comes on and stays on, it means at least one of the tires is underinflated. If TPMS warning light goes on and off, fluctuating ambient temperatures may be the reason. If BMW 840i TPMS warning light flashes for 90 seconds when you start the vehicle and then remains illuminated, the TPMS is not functioning properly and you should have it serviced.
How to reset tire pressure light on BMW 840i?
To reset tire pressure light on BMW 840i, follow the instructions in owner's manual. If tire pressure monitoring system will not reset, there may be a problem with tire pressure sensors.