Other Trouble Codes and Status Messages

Other Diagnostic Trouble Codes
- Read off other diagnostic trouble codes (DTC).
- If diagnostic trouble code EFI-522 is stored: Select Alternative 1.
- If diagnostic trouble code EFI-212 is stored: Select Alternative 2.
- If diagnostic trouble code EFI-522 or EFI-212 are not stored: Select Alternative 3.

Select An Alternative.

Alternative 1:
^ EFI-521, Front heated oxygen sensor (HO2S), heating EFI-522 Rear heated oxygen sensor, heating.

Alternative 2:
^ EFI-212 Front heated oxygen sensor, signal.

Alternative 3:
^ Proceed to test step below.





Other DTCs and Status Messages
Status message
- Select one of the following options to continue:

Alternative 1:
- Refer to: Signal Too High. Permanent Fault.

Alternative 2:
- Refer to: Signal Too Low. Permanent Fault.

Alternative 3:
- Refer to: Signal Missing. Permanent Fault.

Alternative 4:
- Refer to: Faulty Signal. Permanent Fault.

Alternative 5:
- Refer to: Signal Too High. Intermittent Fault.

Alternative 6:
- Refer to: Signal Too Low. Intermittent Fault.

Alternative 7:
- Refer to: Signal Missing. Intermittent Fault.

Alternative 8:
- Refer to: Faulty Signal. Intermittent Fault.