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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Using the SSTs (WDS or Equivalent)

HEATED OXYGEN SENSOR INSPECTION

Using the SSTs (WDS or equivalent)
1. Connect the SSTs (WDS or equivalent) to the DLC.




2. Access "O2S11" "O2S21" "O2S12" and "O2S22" PIDs. The WDS or equivalent measures and shows the voltage.
3. If not as specified, inspect the following.
- Intake-air system
- Fuel system
- On-board diagnostic system

4. If these systems are okay, replace the heated oxygen sensor.