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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Display Group 099





Notes on display field 4:
- For defined troubleshooting, the oxygen sensor control is switched off when display group 099 is selected under "Basic Setting" function 04, and switched on when display group 099 is selected under "Read Measuring Value Block " function 08. When leaving "Basic Setting" function 04, oxygen sensor control is automatically active again.
- You can switch back and forth between "Basic Setting" function 04 and "Read Measuring Value Block" function OB by pressing buttons -4- and -8- on the VAG 1551 scan tool.