Upstream Heated Oxygen Sensor (Ho2S) Not Switching

NOTE: The following test procedures are for DTCs P1131, P1151, P2195, P2196, P2197 and P2198.

Fig 1: Upstream Heated Oxygen Sensor (Ho2S) Switching Detection Condition Possible Cause

Courtesy of MAZDA MOTORS CORP.

Fig 2: Upstream Heated Oxygen Sensor (Ho2S)

Courtesy of MAZDA MOTORS CORP.

UPSTREAM HEATED OXYGEN SENSOR INSPECTION/ACTION CHART

STEP	INSPECTION		ACTION
1	Was PCM Quick Test performed?	Yes	Go to FUEL SYSTEM NOT SWITCHING AT FUEL TRIM (RICH OR LEAN) .
1	Was PCM Quick Test performed?	No	Perform PCM Quick Test. See PCM QUICK TEST . GO tor.

NOTE: The following test procedures are for DTCs P1132 and P1152.

Fig 1: Upstream Heated Oxygen Sensor (Ho2S) Not Switching Detection Condition Possible Cause

Courtesy of MAZDA MOTORS CORP.

Fig 2: Identifying Upstream Heated Oxygen Sensor (Ho2S) Not Switching

Courtesy of MAZDA MOTORS CORP.

UPSTREAM HEATED OXYGEN SENSOR INSPECTION/ACTION CHART

STEP	INSPECTION		ACTION
1	Was PCM Quick Test performed?	Yes	Go to FUEL SYSTEM NOT SWITCHING AT FUEL TRIM (RICH OR LEAN) .
1	Was PCM Quick Test performed?	No	Perform PCM Quick Test. See PCM QUICK TEST . GO to FUEL SYSTEM NOT SWITCHING AT FUEL TRIM (RICH OR LEAN) .