Details On DTCs

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

P0421: 00 (PCM (PYUL)) DETECTION CONDITION AND POSSIBLE CAUSE

System malfunction location	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 and P0304: 00 Fuel injection correction: P0171: 00 and P0172: 00 A/F sensor: P0130: 00, P0131: 00, P0132: 00, P0133: 00, P0134: 00, P064D: 00, P2237: 00, P2243: 00 and P2251: 00 HO2S: P0137: 00, P0138: 00, P013A: 00 and P0140: 00 A/F sensor heater: P0031: 00 and P0032: 00 HO2S heater: P0037: 00 and P0038: 00
	Malfunction determination period	Not applicable
	Drive cycle	2
	Self test type	CMDTC self test
	Sensor used	A/F sensor, HO2S
Fail-safe	Inhibits engine-stop by i-stop control.
Vehicle status when DTCs are output	Not applicable
Possible cause	HO2S malfunction HO2S incorrect installation A/F sensor malfunction A/F sensor incorrect installation Exhaust gas leakage from exhaust system A/F sensor deterioration Catalytic converter (WU-TWC) malfunction (deterioration) PCM malfunction