A temperature gauge that moves up and down can indicate low coolant, air in the system, a sticking thermostat, or a sensor or wiring fault. If it reaches hot or red, or an overheating warning appears, ...

A flashing ESP light often means stability control is responding to wheel slip; a steady light may mean the system is switched off or has detected a fault. Check your owner’s manual. If it stays on, ...

In a tire size such as P225/65R17 100T, 225 is the width in millimeters, 65 is the sidewall height as a percentage of width, R means radial construction, and 17 is the wheel diameter in inches. Check ...

Check all tires while cold and inflate them to the pressure on the driver-door placard. Then follow your owner’s manual to reset or calibrate the TPMS. If the light flashes, returns, or says “Service ...

P0174 means the engine computer detected a lean condition on Bank 2 and reached its fuel-correction limit. Compare fuel-trim data for both banks before replacing parts. Common causes include unmetered ...

If this message appeared after new tires, a wheel swap, or tire service, note what work was done. The system may need a relearn, but the message alone cannot confirm that. Here’s how to check pressure ...

Do not drive on a flat, nearly flat, or rapidly deflating tire. Ease off the accelerator, keep the vehicle steady, and pull over somewhere safe. Use the spare only if you can change it safely and your ...

Most airbag lights cannot be reset reliably without reading and repairing the stored SRS fault. Use a scanner that can access the airbag module, fix the cause, then clear the code using the vehicle’s ...

Too much transmission fluid can cause foaming or shifting problems. Check the level using your vehicle’s exact procedure, and correct it if it’s high. Transmission fluid level checks can be ...

The tire-pressure warning light usually means one or more tires are underinflated; on some vehicles it can also signal a TPMS fault. Check all tires cold against the driver-door placard and inspect ...

A Service Safety Restraint System warning means the airbag or seat-belt pretensioner system has detected a fault and may not work as intended. Have the SRS module scanned and repaired; avoid probing ...

The Performance Tool W1 is our top pick for most drivers because its 20-inch, four-way design offers leverage and several socket sizes. Check that a socket fits your vehicle’s lug nuts, and use a ...