Md Amir

To check brake pads, look through the wheel spokes to see if the friction material is thinner than 1/4 inch (6mm) or listen for high-pitched squealing.

To check ball joints, lift the vehicle safely, grab the tire at the 12 and 6 o’clock positions, and rock it vertically to feel for clunking or excessive play.

To check an O2 sensor, back-probe the signal wires with a multimeter set to DC voltage and watch for rapid fluctuation between 0.1V and 0.9V while the engine

Set your multimeter to 20V DC, start the engine, and touch probes to the battery terminals; a reading of 13.5 to 14.5 volts confirms the unit works.

To check air pressure in tires, remove the valve cap, press the gauge firmly onto the valve stem until the hissing stops, and read the PSI number.

Check a VIN number on a car by looking at the driver’s side dashboard corner, the driver’s door jamb sticker, or stamped on the engine block.

You can verify a vehicle’s history without cost by using the National Insurance Crime Bureau (NICB) for theft records, the NHTSA site for safety recalls, or

You can check a starter solenoid by listening for a click, bridging the terminals with a screwdriver, or using a multimeter to measure resistance and voltage

Shake the removed valve. A rattle means it is clean; silence means it is clogged. Also, test for suction at the valve opening while the engine idles.

You can check a car fuse by pulling it out to look for a broken internal wire or by using a multimeter to test for continuity across the metal tabs.