Four Wheel Logic

Common signs of a bad oil pump include low oil pressure readings, noisy lifters, engine overheating, and warning lights that stay on while you drive.

Common signs of a bad MAF sensor include rough idle, poor acceleration, higher fuel use, black exhaust smoke, and a check engine light.

Common signs of a bad ignition switch are hard starting, random stalling, dead dash lights, and accessories that cut out when you move the key.

Common signs of a bad oxygen sensor include a check engine light, poor fuel economy, rough idle, failed emissions, and sluggish acceleration.

A bad O2 sensor usually brings a check engine light, poor mileage, rough running, or failed emissions tests on your car.

Common signs of a bad catalytic converter include a check engine light, weak acceleration, rotten egg exhaust smell, poor fuel use, and rattling under the car.

A bad fuel filter usually shows up as hard starts, weak acceleration, stalling, or misfires when the engine needs more fuel.

You know a fuel pump went out when the engine cranks, stumbles under load, and fuel pressure at the rail drops below normal.

Common signs your fuel pump is out are hard starting, stalling, power loss under load, whining from the tank, and low fuel pressure readings.

Common signs of a bad fuel pump include hard starts, loss of power, sputtering at speed, and a loud whine from the tank.