Application Guide

ManualsBrandsBosch ManualsAutomotiveBosch 17361 Oxygen Sensor, Original Equipment (Audi, Volkswagen)

ECU

Catalytic Converter

Primary

Oxygen

Sensor

Fuel Injector

Spark Plug

MAF Sensor

The worldwide leader in oxygen sensor technology

Bosch invented the automotive oxygen sensor in 1976, and

has been at the forefront of the technology ever since. Bosch

works closely vehicle manufacturers worldwide to create the

most efﬁcient and reliable systems to keep your vehicle

running efﬁciently. Our experience with vehicle manufactures

means we have the capability to produce parts that meet

vehicle speciﬁcations.

What is an oxygen sensor?

An oxygen sensor detects the amount of oxygen in a vehicle’s

exhaust system and sends a signal to the Engine Control Unit

(ECU), which adjusts the amount of fuel delivered to the

combustion chamber.

Too much oxygen in the exhaust or too little fuel being fed to

the engine indicates a lean mixture, which can cause

performance problems. Too little oxygen or too much fuel in

the exhaust indicates a rich mixture, which results in lower

MPG and excess emissions. Either condition can shorten the

life of the catalytic converter, which removes harmful

pollutants from the exhaust.

Almost all gasoline powered vehicles since 1986 have at least

one oxygen sensor, and vehicles manufactured since 1996 will

have at least two. There is one sensor that is located before the

catalytic converter to communicate with the EMC to let the car

know if it needs to use more or less fuel. A second sensor is

located after the catalytic converter to make sure that the

catalytic converter is working properly.

Engine Control Unit

Receives information from the primary oxygen

sensor regarding the amount of contaminants

in the combustion system.

Primary Oxygen Sensor

Positioned before the catalytic converter, these sensors send

engine air-fuel reference signals to the ECU so that fuel delivery is

adjusted to optimal working conditions.

Secondary Oxygen Sensor

The secondary oxygen sensor is used to monitor the efﬁciency

of the catalytic converter and sends signals regarding how well

the vehicles catalytic converter is working.

Mass Air Flow Sensors (MAF)

MAF Sensors record the exact air-fuel ratio entering the

combustion engine. The sensor then transmits this information

electrical signal to the ECU.

Catalytic Converter

Removes contaminants from the combustions system. Without

the correct air-fuel mixture provided by the ECM, the converter

cannot eliminate harmful pollutants from the exhaust gases.

Combustions Chamber

The fuel injector sprays fuel into the combustions chamber.

Fuel is then projected into the cylinder, removing all of the

oxygen and igniting the the spark plug.

Fuel Injector

Based on a signal received from the ECM, the right amount of

fuel is delivered to the combustion chamber resulting in the

optimal air-fuel mixture in the engine.

Spark Plug

The spark plug is designed to produce the spark

that ignites the air-fuel mixture in the combustion

chamber of gasoline engines.

Secondary

Oxygen

Sensor

Combustions Chamber

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Bosch Oxygen Sensors

Summary of content (2 pages)

PAGE 1
Bosch Oxygen Sensors The worldwide leader in oxygen sensor technology Too much oxygen in the exhaust or too little fuel being fed to Bosch invented the automotive oxygen sensor in 1976, and the engine indicates a lean mixture, which can cause has been at the forefront of the technology ever since. Bosch performance problems.
PAGE 2
Why do i need to replace my oxygen sensor? When to replace an oxygen sensor It is important to replace your oxygen sensors at the Exposure to carbon, soot, harmful gases, antifreeze, manufacturer’s suggested intervals or upon failure, whichever chemicals, and thermal and physical shock will shorten the occurs first. Prompt replacement will save you money in the life of an oxygen sensor. A worn sensor can result in reduced long term.