Details On DTCs

WARNING: This page is about a different car, the 2017 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.

DETECTION CONDITION AND POSSIBLE CAUSE

DESCRIPTION	HO2S circuit high input
DETECTION CONDITION	Determination conditions	A condition in which the HO2S input voltage exceeds the specified value continues for the specified period.
	Preconditions	Not applicable
	Malfunction determination period	5 s period
	Drive cycle	2
	Self test type	CMDTC self test, KOEO self test, KOER self test
	Sensor used	HO2S
FAIL-SAFE FUNCTION	Not applicable
VEHICLE STATUS WHEN DTCs ARE OUTPUT	Illuminates check engine light.
POSSIBLE CAUSE	HO2S connector or terminals malfunction PCM connector or terminals malfunction Short to power supply in wiring harness between the following terminals: HO2S terminal A-PCM terminal 2AI HO2S terminal B-PCM terminal 2AG HO2S malfunction PCM malfunction