Emissions - MIL ON/DTC P0420 (Catalytic Converter) Set

03-073

October 31, 2003

Applies To:
1998-99 Accord V6 - ALL
1999-01 Odyssey - ALL

MIL Is ON With DTC P0420

SYMPTOM

The MIL is on, and DTC P0420 (catalyst system efficiency below threshold) is stored.

PROBABLE CAUSE

The catalytic converter has deteriorated.

CORRECTIVE ACTION

Replace the catalytic converter, and check for any related DTCs.





PARTS INFORMATION





WARRANTY CLAIM INFORMATION

In warranty: The normal warranty applies.

NOTE:
Catalytic converters are covered by the 8/80 Federal and California emissions warranties.

Failed Part: P/N 18160-P8C-A00
H/C 5433941

Defect Code: 091

Contention Code: B99

Skill Level: Repair Technician

Out of warranty:
Any repair performed after warranty expiration may be eligible for goodwill consideration by the District Parts and Service Manager or your Zone Office. You must request consideration, and get a decision, before starting work.

DIAGNOSIS

Connect the HDS to the DLC (data link connector) and read the stored DTC(s).

^ If DTC P0420 is the only code, go to REPAIR PROCEDURE.

^ If other DTCs are stored along with P0420 troubleshoot those codes first. Failure of other components could contribute to the failure of the catalytic converter, and could cause it to fail again. Then go to REPAIR PROCEDURE.

REPAIR PROCEDURE

1. Accord only: Determine the emissions type (KA or KL) of the vehicle. Either do a VIN Status Inquiry on iN, or examine the catalytic converter. On a KA emissions type vehicle, the secondary oxygen sensor is in the middle of the converter. On a KL emissions type vehicle, the oxygen sensor is in the rear of the converter.

2. Replace the catalytic converter. If the mounting bolts do not break due to corrosion when you remove the original upper and lower covers, then reuse the covers. Otherwise, replace the covers and the mounting bolts.





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