Details On DTCs

WARNING: This page is about a different variant/trim than selected.

DTC P0421-00: (PCM, VIN Y) DETECTION CONDITION AND POSSIBLE CAUSE

DESCRIPTION	Catalytic converter system
DETECTION CONDITION	Determination conditions	The PCM detects that the HO2S output fluctuates from lean to rich in a short amount of time at specified times continuously after recovery from fuel cut control.
	Preconditions	Catalytic converter (WU-TWC) is activated sufficiently. A/F sensor is activated sufficiently. HO2S is activated sufficiently. The following DTCs are not detected: Misfire: P0300-00:, P0301-00:, P0302-00:, P0303-00:, P0304-00: Fuel injection correction: P0171-00:, P0172-00:, P2096-00:, P2097-00: A/F sensor: P0130-00:, P0131-00:, P0132-00:, P0133-00:, P0134-00:, P064D-00:, P2237-00:, P2243-00:, P2251-00: HO2S: P0137-00:, P0138-00:, P013A-00:, P013B-00:, P0140-00: A/F sensor heater: P0031-00:, P0032-00: HO2S heater: P0037-00:, P0038-00:
	Drive cycle	1 (U.S.A). 2 (except U.S.A).
	Self test type	CMDTC self test
	Sensor used	A/F sensor, HO2S
FAIL-SAFE FUNCTION	Not applicable
VEHICLE STATUS WHEN DTCs ARE OUTPUT	Illuminates check engine light.
POSSIBLE CAUSE	HO2S malfunction HO2S loose A/F sensor malfunction A/F sensor loose Exhaust system leakage A/F sensor deterioration Catalytic converter (WU-TWC) deterioration or malfunction PCM malfunction