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Analyzer shows oxygen sensor voltage 0.0 mV

A constant reading of 0.0 mV indicates that the oxygen sensor signal is not being detected. Follow the steps below to identify whether the issue is caused by the sensor or the cable.

Possible causes

  • Depleted oxygen sensor

  • Reversed cable polarity

  • Corroded cable or connector

What to try

  • Check the oxygen sensor age. Replace the sensor if it is older than 5 years.

  • Test the sensor in another compatible analyzer or measure the sensor voltage directly using a multimeter.

  • Inspect the sensor pins and contacts for corrosion. Replace the sensor if corrosion is present.

  • Inspect the cable and wiring for visible damage.

  • Verify cable polarity. Ensure the red wire corresponds to the positive (+) mark on the board.

  • If the cable-to-board connection is accessible, carefully reverse the cable polarity to determine whether polarity is the cause.

  • Confirm wiring continuity using a multimeter.

When to contact service

If installing a new oxygen sensor does not resolve the issue and cable polarity or wiring checks show no improvement, please contact an authorized Divesoft Service Point for further diagnostics.

You can find your nearest authorized service location on our Service Centers page.