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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Emission Control Systems: Description and Operation




Emission control

Euro II Oxygen sensor closed-loop control and 3-way catalytic converter separate for both cylinder banks (RoW and Europe not including Germany)

Euro II/D4 Additional secondary air system (Germany and Taiwan)

USA LEV* Oxygen sensor closed-loop control and 3-way catalytic converter with a primary and main catalytic converter separate for both cylinder banks, secondary air system, on-board refuelling system (ORVR)

*LEV - low emission vehicle