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)

Or, hide this message: temporarily or permanently

Oxygen Sensor Relay: Diagrams


2007-2009 Ram truck, 6.7L, use an O2 module for oxygen sensor heater control.




The oxygen sensor module (1) is located under the vehicle. It is bolted to the outer side of right frame rail (4).