Details On DTCs

WARNING: This page is about a different car, the 2020 Mazda CX-30. However, it is still accessible from the selected car via links, so may be relevant.

DTC P0137:00 (PCM, SKYACTIV-G, US) DETECTION CONDITION AND POSSIBLE CAUSE

Description	HO2S circuit low input
Detection condition	Determination conditions	A condition in which the HO2S input voltage is less than the specified value continues for the specified period.
	Preconditions	HO2S is activated. The following DTCs are not detected: MAF sensor: P0100:00, P0101:00 and U060F:00 ECT sensor No. 1: P0117:00 and P0118:00
	Malfunction determination period	5 s period
	Drive cycle	2
	Self test type	CM DTC self test
	Sensor used	HO2S
Fail-safe function	Fixes duty value of A/F sensor heater Stops fuel feedback control of A/F sensor
Vehicle status when DTCs are output	Not applicable
Possible cause	HO2S connector or terminals malfunction PCM connector or terminals malfunction Short to ground in HO2S signal (+) circuit Open circuit in any of the following HO2S circuits. Signal (+) circuit Signal (-) circuit HO2S malfunction PCM malfunction
Courtesy of MAZDA MOTORS CORP.