The quickest way is to read the Tire Pressure Monitoring System (TPMS) readout if your Civic supports it; if not, check each tire with a gauge against the door-jamb sticker to identify the low one, then inflate to the recommended cold pressure. After inflating, a short drive should reset the system.
Using the TPMS readout to locate a low tire
On many 2018 Civics equipped with direct TPMS, the instrument cluster can display each tire’s current pressure. This makes it easy to see which tire is underinflated without guessing.
- Park on a level surface and turn the ignition to ON to power the dash display.
- Use the INFO button on the steering wheel (or navigate the dash menu) to reach the TPMS screen that shows pressures for LF, RF, LR, and RR.
- Identify the tire with a pressure significantly lower than the others or below the vehicle’s recommended spec.
- Inflate that tire to the recommended cold pressure using a quality gauge, then recheck the other tires as needed.
After inflating, drive for a few minutes to allow the TPMS to refresh. If the warning persists, there may be a slow leak or sensor issue requiring service.
Manual tire pressure check if the readout isn’t available
If your Civic doesn’t display per-tire pressures, or you want to double-check, use a tire gauge to measure each tire and compare to the door-jamb specification.
- Make sure the tires are cold before measuring. Park on a flat surface and wait several hours if you’ve been driving.
- Find the recommended cold pressure on the driver’s door jamb placard for your tire size and loading.
- Remove valve caps and press the gauge onto each valve stem to read LF, RF, LR, and RR.
- Identify the tire with the lowest reading that’s below the spec.
- Inflate the low tire to the recommended pressure, then recheck all four tires for uniformity.
After inflating to spec, take a short test drive; the TPMS light should turn off once the system reconfirms proper pressures. If it stays on, inspect for punctures or slow leaks or seek professional help.
Other tips and considerations
Regularly checking tire pressure helps prolong tread life, improve fuel economy, and keep you safe on the road. Always follow the placard and tire sidewall ratings, and remember to recheck after driving in hot weather or after a long trip.
TPMS relearn and sensor considerations
If you’ve replaced tires, swapped wheels, or replaced sensors, you may need a TPMS relearn procedure at a dealer or service shop. The owner’s manual for your trim will provide exact steps, as they can vary by model year and wheel size.
When to seek professional help
If you cannot identify a low tire, notice rapid air loss, or the TPMS warning remains after inflating to spec, contact a Honda service center or a qualified tire shop to inspect for leaks or faulty sensors.
Summary
To tell which tire is low on a 2018 Honda Civic, start with the TPMS readout if your model supports it. If not, or for verification, check each tire with a gauge against the door-jamb specification. Inflate the low tire to the recommended cold pressure, then drive to let the TPMS recalibrate. Regular checks help prevent flats and improve safety.
How to identify which tire has low pressure?
Without a Gauge
- Look at the wheels. An underinflated tire will appear flat where it meets the road.
- Feel the wheels. If the tire is soft when you press on it, it probably has low pressure and needs more air.
- Load weight into the vehicle.
- Look for handling changes.
- Take the vehicle to a mechanic.
Do Honda Civics have low profile tires?
Moving up to the Sport and Sport Hybrid trims, Honda upgrades to 18-inch gloss black alloy wheels paired with lower-profile 235/40 R18 all-season tires.
How to tell which tire is low on a Honda Civic?
Instead of directly measuring the pressure in each tire, the TPMS on this vehicle monitors and compares the rolling radius and rotational characteristics of each wheel and tire while you are driving to determine if one or more tires are significantly under-inflated.
Does a 2018 Honda Civic tell you which tire is low?
The Feature: This system can inform drivers of which tire has low air pressure via the TPMS readout in the instrument panel. Individual sensors in each tire monitor pressure and transmit the data to a receiver in the system. The pressure reading for each tire is displayed in the instrument panel.