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

O2 Heater

PURPOSE
To heat the O2 sensor.

LOCATION
An integral part of the O2 sensor.

OPERATION
The O2 sensor does not operate until a certain temperature is reached. The heater warms the sensor up faster than if it had to rely simply on exhaust gas heat. The MPFI system then controls the A/F mixture sooner, reducing exhaust emissions.