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)
Or, hide this message:
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,
Oxygen Sensor (O2S) right (Bank 1) and O2S left (Bank 2) voltages, short term fuel trim Bank 1 and 2 and long term fuel trim Bank 1 and 2. A problem in the Oxygen Sensor circuits, or fuel system, should set a DTC 13 or 63 (open circuit), DTC 44, 64 (lean indication), DTC 45, 65 (rich indication). Refer to applicable chart if any of these DTC(s) were stored in memory.