Automotive Diagnostics, Torque & Trailer Wiring

What does an oscillating voltage reading between 0.1V and 0.9V on an upstream Zirconia Oxygen Sensor indicate?

Next

 Correct IncorrectNormal closed-loop operation. The sensor toggles several times per second across the stoichiometric point (~0.45V) between lean (0.1V) and rich (0.9V).

What does an oscillating voltage reading between 0.1V and 0.9V on an upstream Zirconia Oxygen Sensor indicate?

• The oxygen sensor has an internal short circuit
• The fuel pump is about to fail
• Normal closed-loop operation cycling rapidly across the stoichiometric 14.7:1 air-fuel balance
• The catalytic converter is completely clogged