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 or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

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H84 - Check HO2S Circuit Continuity

- Key Off.

- PCM connected.

- Suspect HO2S disconnected.

- Jumper HO2S Signal to VPWR at the HO2S harness connector.

- Scan Tool connected.

- Key On, Engine Off.

Heated Oxygen Sensor Codes And Test Pins:

- Access the correct HO2S PID.

NOTE: (HO2S displayed as O2S on Scan Tool.)

- Is the voltage reading greater than 3.50 volts?

YES -- REPLACE HO2S. COMPLETE PCM reset to clear DTCs. Clearing Diagnostic Trouble Codes

COMPLETE a HO2S Monitor Drive Cycle. Monitors, Trips, Drive Cycles and Readiness Codes

NO -- GO to H85. H85 - Check HO2S Harness Circuit For Short to VPWR and Ground