Analyzer shows oxygen sensor damaged or not detected Error 2

Depleted oxygen sensor
Disconnected or damaged sensor cable
Residual gas with 0% O₂ in the measuring path (e.g., argon, nitrogen, or helium)
Internal electronics malfunction

Check the oxygen sensor date of manufacture. If the sensor is older than 24 months, consider replacing it.
Inspect the sensor cable for green oxidation, which may indicate oxygen sensor leakage. If oxidation is present, replace both the sensor and the cable (part #1035).
If the last measured gas contained 0% oxygen, flush the analyzer thoroughly with ambient air. If necessary, turn the device off and back on.
Test the analyzer with a known good oxygen sensor, if available.

If Error 2 persists even with a new or known good oxygen sensor installed, please return the analyzer for professional service.

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

The “Error 2” message indicates that the oxygen sensor voltage is extremely low or not detected during startup. Follow the steps below to determine the cause.