Applies To: 1998-2002 Accord DX and L4 EX/LX LEV — all.

The MIL comes on with DTC P0133 (primary heated oxygen sensor slow response).

Some brands of fuel and/or fuel additive packages may create deposits at the fuel injector tips. This buildup may cause slight air/fuel deviations between each cylinder. Buildup of these deposits, when coupled with very specific driving conditions, may cause the MIL to come on and the powertrain control module (PCM) to store DTC P0133.

Corrective Action
Replace the primary heated oxygen sensor (HO2S) and the fuel injectors.

For 1998-2000 models only: Compare the vehicle’s ECM/PCM part number to Parts Information. If the numbers do not match, replace the ECM/PCM.

Parts Information
• Oxygen Sensor: P/N 36531-PAA-305
• Fuel Injector (4 required): P/N 06164-P8A-A00

A/T PCM:
• EX/LX LEV: 1998-’99: P/N 37820-PAA-407
2000: P/N 37820-PAA-405
• DX with KA emissions (49 states): 1998-’99: P/N 37820-PAB-307
• DX with KL emissions (California): 1998-’99: P/N 37820-PAB-405
• DX LEV: 2000: P/N 37820-PAB-305

M/T ECM:
• EX/LX LEV: 1998-’99: P/N 37820-PAA-408
2000: P/N 37820-PAA-406
• DX with KA emissions (49 states): 1998-’99: P/N 37820-PAB-309
• DX with KL emissions (California): 1998-’99: P/N 37820-PAB-406
• DX LEV: 2000: P/N 37820-PAB-306

Tool Information
• 02 Sensor Wrench: T/N Snap-on YA5575 or SP Tools 93750 or equivalent (commercially available).

Repair Procedure
1. Confirm the DTC with the PGM Tester.

2. Replace the fuel injectors (see page 11-97 in the 1998-2002 Accord Service Manual).

3. Replace the primary HO2S (see page 11-99 in the service manual).
– For 2001-’02 models, the repair procedure is complete. Return the vehicle to the customer.
– For 1995-2000 models, go to step 4.

4. Find the ECM/PCM part number, and compare it to the part numbers in Parts Information.
– If the ECM/PCM part number is the same, return the vehicle to the customer.
– If the ECM/PCM part number is different, go to step 5.

5. For 2000 model only: Download the immobilizer codes from the ECM/PCM with the PGM Tester. Refer to “Rewriting a New ECM/PCM” in Service Bulletin 00-049, Immobilizer System (Type 2), found under Body Electrical.

6. Remove the ECM/PCM.

7. Replace the ECM/PCM in the reverse order of removal.

8. Rewrite the immobilizer codes into the PCM with the PGM Tester.
Refer to “Rewriting a New ECM/PCM” in Service Bulletin 00-049, Immobilizer System (Type 2), found under Body Electrical.

Note: For 1995-’99 models, you will need all of the working ignition keys.

Technical service bulletin courtesy of Mitchell 1.

For more information on Mitchell 1 products and services, automotive professionals can log onto the company’s website at www.mitchell1.com.