Engine Controls - MIL ON/DTCs P1172/P2A00 Stored

07-006

July 21, 2011

Applies To:
See VEHICLES AFFECTED

MIL Is On With DTC P1172 or P2A00

(Supersedes 07-006, dated July 21, 2011, to revise the information marked by the black bars)





REVISION SUMMARY

SYMPTOM

The MIL is on with PGM-FI DTC P1172 (air fuel sensor [sensor 1] circuit out of range, high) and/or P2A00 (air fuel sensor [sensor 1] circuit range/performance problem).

PROBABLE CAUSE

The air/fuel sensor is damaged by moisture in the exhaust system during engine warm-up.








VEHICLES AFFECTED

CORRECTIVE ACTION

Update the ECM/PCM PGM-FI software, then replace the air/fuel sensor. On certain Fits (see VEHICLES AFFECTED), the PGM-FI update is not needed.

NOTE:
The PGM-FI software has been changed to delay A/F sensor heater operation when there is a high probability of moisture on the A/F sensor.





PARTS INFORMATION





SOFTWARE INFORMATION





WARRANTY CLAIM INFORMATION

REPAIR PROCEDURE

1. Update the PGM-FI software with the HDS. Refer to Service Bulletin 01-023, Updating Control Units/ Modules.

NOTE:
On certain Fits (see VEHICLES AFFECTED), the PGM-FI update is not needed.

2. If applicable, replace the air/fuel sensor (see VEHICLES AFFECTED):

^ Refer to the Fuel and Emissions section for the specific engine in the appropriate service manual, or

^ Online, enter keyword A/F, and select A/F Sensor Replacement from the list.





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