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Oxygen Sensor Voltage Codes – Part 1, by Matthew Shanahan

One way to accurately check the A/F sensor is with a gas analyzer. It allows you to compare the actual air/fuel ratio to what the sensor thinks. Using the gas analyzer helps reduce the guessing when replacing an A/F sensor. 

Matt Shanahan uses a Techstream and the EMS 5003-5 to diagnose a A 2005 Toyota Prius 1NZ-FXE that needs to pass emissions by the end of the month.

Read the complete article at Technician.Academy.

 

 

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