Operation CHARM: Car repair manuals for everyone.
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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HO2S2 - Check HO2S Sensor Ground



- Key OFF.

- Disconnect the HO2S connector.

- Measure the resistance of the GND wire between the GND terminal at the HO2S sensor harness connector and ground.

- Is the resistance less than 5 ohms?

Yes -- Go to H02S3. HO2S3 - Check HO2S Wire to PCM For Open

No -- Service the HO2S GND wire.