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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temporarily or
permanently
Oxygen Sensor: Testing and Inspection
The Tech 1 scan tool has several positions that will indicate the state of the exhaust gases, 02S voltage, short term and long term fuel trim.
A problem in the 02S circuit should set a DTC 13 (open circuit), DTC 44 (lean 02S indication), DTC 45 (rich 02S indication). Refer to applicable chart, if any of these DTC(s) were stored in memory.
Testing and Inspection