Mazda CX-5 Service & Repair Manual: Heated Oxygen Sensor (HO2 S)

Mazda CX-5 Service & Repair Manual / Engine / Control / Heated Oxygen Sensor (HO2 S)

Purpose/Function

Detects the oxygen concentration (theoretical air/fuel ratio) in the exhaust gas as basic information for mainly determining the fuel injection amount and as information for determining the deterioration of catalytic converter.
Detects the oxygen concentration (theoretical air/fuel ratio) in the exhaust gas and inputs it to the PCM as an oxygen concentration (theoretical air/fuel ratio) signal.

Construction

Installed to the exhaust manifold.
A zirconia element has been adopted as the detecting element for detecting the oxygen concentration (theoretical air/fuel ratio).

Operation

Inputs the signal, which fluctuates according to the oxygen concentration (theoretical air/fuel ratio), to the PCM.

HO2S characteristic

Fail-safe


DTC No.	Fail-safe function
P0037:00	Stops the fuel feedback control of the HO2S.
P0038:00	Stops the fuel feedback control of the HO2S.

Heated Oxygen Sensor (HO2 S) Removal/Installation

WARNING: A hot engine and exhaust system can cause severe burns. Turn off the engine and wait until they are cool before removing the exhaust system. CAUTION: Do not allow fla ...

Intake Air Temperature (Iat) Sensor Inspection

IAT Sensor No.1 Resistance inspection NOTE: Because the IAT sensor No.1 is integrated in the MAF sensor, replacing the IAT sensor No.1 includes replacement of the MAF sensor/IAT sensor No ...

Other materials:

Rear Heat Duct Removal/Installation
1. Disconnect the negative battery cable.. 2. Remove the following parts: a. Decoration panel. b. Shift lever knob (MTX). c. Front console box. d. Shift panel. e. Upper panel. f. Rear console. g. Side wall. h. Front console. i. Front scuff plate. j. Front side trim. k. Joint ...

Rear Center Seat Belt Removal/Installation
CAUTION: The ELR (emergency locking retractor) has a spring that will unwind if the retractor cover is removed. The spring cannot be rewound by hand. If this occurs, the ELR will not work properly. Therefore, do not disassemble the retractor. 1. Press the release switch, then dis ...

Liftgate Opener System
Outline A liftgate opener system has been adopted in which the liftgate can be opened just by pressing the liftgate opener switch. The rear body control module (RBCM) performs liftgate opener system fail-safe.. Function When the liftgate opener switch is pressed, the l ...