Four Wheel Logic

You can check a VIN number for free through official recall tools, NICB VINCheck, and trusted VIN decoders that give basic history without fees.

To check antifreeze, read the coolant level in the reservoir when the engine is cold, then confirm color and strength before you drive.

To check antifreeze level, let the engine cool, find the reservoir, and confirm coolant sits between the low and full marks on the tank.

To check fuel pressure, connect a gauge, run the pump, and compare the reading with your vehicle’s specified PSI range.

To check for spark, use a plug-style spark tester between the lead and ground, crank the engine, and watch for a bright, regular blue arc.

To check for recalls on your car, find your VIN and run it through an official recall lookup tool, then follow the repair steps listed.

To check power steering fluid, park level, locate the reservoir, then match the fluid to the dipstick or fill marks for the correct range.

To check engine oil, park level, let the engine rest, wipe and reinsert the dipstick, then confirm the oil sits between the low and full marks.

To test an O2 sensor, measure live voltage or fuel trims and confirm the sensor switches cleanly across the normal range under load.

To test a thermostat, confirm its reading with a trusted thermometer and check how your heating or cooling reacts when you change the set temperature.