O2 monitor test – Sealey EU908 User Manual

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Since DTCs cleared

MIL Status

OFF

Misfire Monitoring

N/A

Fuel system monitoring

OK

Comprehensive
component monitoring

OK

Catalyst monitoring

N/A

Heated catalyst monitor

N/A

Figure 6.21

5) If the vehicle supports readiness test of “This Drive Cycle”, a

screen of the following displays: (Figure 6.22)

This Drive Cycle

MIL Status

OFF

Misfire Monitoring

N/A

Fuel system monitoring

OK

Comprehensive
component monitoring

OK

Catalyst monitoring

N/A

Heated catalyst monitor

N/A

Figure 6.22

6) Use the UP/DOWN scroll button for more PIDs if additional

information is available on more than one page. Or use the
LEFT/RIGHT scroll button to view PIDs in the previous/next
page.

7) Press the ESC button to return to Diagnostic Menu.

6.6. O2 Monitor Test

OBD2 regulations set by SAE require that relevant vehicles

monitor and tests on the oxygen (O2) sensors to identify problems
related to fuel efficiency and vehicle emissions. These tests are not
on-demand tests and they are done automatically when engine
operating conditions are within specified limits. These test results
are saved in the on-board computer's memory.

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