Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la
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Sensor Heating Element Test

1. Disconnect the Heated Oxygen Sensor (O2S), electrical connector from the wiring harness.
2. Set DVOM to read OHMS. Connect the ohmmeter between the heater feed and heater ground.
- The white wires in the sensor connector are the power and ground circuits for the heater.
- Connect the ohmmeter test leads to terminals of the white wires in the heated oxygen sensor connector.
3. Resistance should be between 4 and 7 ohms.
- If not replace the sensor.