Operation CHARM: Car repair manuals for everyone.

CO-Check and Adjustments


Connect the Lambda sensor.

Warm up the engine to normal operating temperature. Check that ignition timing and idle speed are within specification. Adjust when necessary.

Check the reading according to Table 2. The readings will not be stable. With the correct co-setting, the reading should fluctuate around the values in Table 2.


If the readings are out of specification, adjust to specified value.