Can a bad O2 sensor cause a car to stall?
Can a bad O2 sensor cause a car to stall? Bad performance. Your car may misfire or experience hesitation and stalling. Most cars default to the factory air-to-fuel ratio if the oxygen sensor fails, which can cause problems because of non-standard temperature, moisture, or air composition. How does an O2 sensor work in a catalytic converter? You can also check exhaust backpressure ahead of the converter by connecting a pressure gauge to the EGR exhaust port, an O2 sensor port, or an exhaust manifold air line connection. More than 1.25 psi of backpressure at idle, or more than 3 psi...