April 5, 2026: LEMON Manuals is launched! Read the announcement.

Heated Oxygen Sensor

HEATED OXYGEN SENSOR (HO2S) VOLTAGE

Application

Volts

B2300, B3000, B4000 & Tribute

⁽¹⁾

Mazda6, MPV, & Protege⁽²⁾

Acceleration

0.5-1.0

Deceleration

0-0.5

Miata ⁽³⁾

Acceleration

0.5-1.0

Deceleration

0-0.5

⁽¹⁾	No information available from manufacturer.

⁽²⁾	Measure voltage between terminals "A" and "B" (for both front and rear HO2S).

⁽³⁾	Measure voltage between terminal "A" and ground (for both front and rear HO2S). See Fig 3 .

Fig 1: Identifying HO2S Terminals (Mazda6 - 2.3L)

G00250873

Courtesy of MAZDA MOTORS CORP.

Fig 2: Identifying HO2S Terminals (Mazda6 - 3.0L)

G00252964

Courtesy of MAZDA MOTORS CORP.

Fig 3: Identifying HO2S Terminals (Miata)

G00252965

Courtesy of MAZDA MOTORS CORP.

Fig 4: Identifying HO2S Terminals (MPV)

G00252966

Courtesy of MAZDA MOTORS CORP.

Fig 5: Identifying HO2S Terminals (Protege)

G00252967

Courtesy of MAZDA MOTORS CORP.