Bad Sensor? How to Test O2, MAF, and ABS Sensors with a Multimeter

Is your Check Engine Light on? Before you spend hundreds on new parts, test your sensors to see if they are actually the problem.

Testing Oxygen (O2) Sensors

A bad O2 sensor ruins gas mileage. Learn how to back-probe the connector and watch the voltage fluctuation to verify its health.

MAF Sensor Troubleshooting

Mass Air Flow sensors get dirty. Sometimes a simple cleaning fixes the issue. We explain how to test the signal wire for proper response.