Why do I need to replace my Trust the experience of Bosch The worldwide leader in oxygen oxygen sensor? Since 1976 Bosch has produced over 1 billion oxygen sensor technology sensors. In addition to being the originator of this It is important to replace your oxygen sensors at the Bosch invented the automotive oxygen sensor important technology, Bosch is the leader and global manufacturer’s suggested intervals or upon failure, in 1976, and has been at the forefront of the aftermarket supplier of oxygen sensors. whichever occurs first. Prompt replacement will technology ever since. We work closely with vehicle save you money in the long term. Here’s how: manufacturers worldwide to create the most ffIf an oxygen sensor is not functioning properly, it efficient and reliable systems to keep your vehicle may not accurately measure the amount of fuel running smoothly. Our experience with vehicle Oxygen manufacturers means we have the capability to being consumed and cannot efficiently regulate the consumption. This results in lower MPG. produce parts that meet vehicle specifications. ffA faulty oxygen sensor can cause your catalytic Sensors converter to fail prematurely. The catalytic What is an oxygen sensor? converter is responsible for removing the harmful An oxygen sensor detects the amount of oxygen emissions from your exhaust gas. Replacing a in a vehicle’s exhaust system and sends a catalytic converter can cost thousands of dollars, signal to the Engine Control Unit (ECU), which significantly more than most oxygen adjusts the amount of fuel delivered to the sensor replacements. combustion chamber. ffToo much oxygen in the exhaust or too little fuel What is the difference being fed to the engine indicates a lean mixture, between Wideband and which can cause performance problems. ffToo little oxygen or too much fuel in the exhaust Air-Fuel sensors? indicates a rich mixture, which results in lower MPG ffA Bosch Air-Fuel Oxygen Sensor detects if your and excess emissions. engine is running rich or lean. Either condition can shorten the life of the catalytic ffA Bosch Wideband Oxygen Sensor measures the converter, which removes harmful pollutants from precise amount of oxygen in the exhaust to tell your the exhaust. ECU exactly how much fuel your engine needs to operate at optimal combustion. Almost all gasoline powered vehicles since 1986 have at least one oxygen sensor, and vehicles ffTechnical advances like the Bosch Wideband manufactured since 1996 will have at least two. Oxygen Sensor have allowed vehicle There is one sensor located before the catalytic manufacturers to increase fuel economy as well Robert Bosch LLC converter to communicate with the Engine Control as engine performance. Broadview, Illinois 60155 Module (ECM) to let the car know if it needs to Robert Bosch, Inc. use more or less fuel. A second sensor is located Mississauga, Ontario L5N 1R1 after the catalytic converter to make sure that the www.boschautoparts.com catalytic converter is working properly. www.boschautoparts.ca

1806021 ©2018 Robert Bosch LLC, USA. All rights reserved. BOSCH is a registered trademark of Robert Bosch GmbH and/or its affiliated entities. 1 Engine Control Unit 1 5 Combustion Chamber Receives information from the primary oxygen The fuel injector sprays fuel into the combustion chamber. sensor regarding the amount of contaminants in the Fuel is then projected into the cylinder, removing all of the combustion system. oxygen and igniting the the spark plug. 2 2 Fuel Injector 6 Upstream Oxygen Sensor 4 Based on a signal received from the ECM, the fuel injector Positioned before the catalytic converter, these sensors delivers the right amount of fuel to the combustion chamber send engine air-fuel reference signals to the ECU so that — resulting in the optimal air-fuel mixture in the engine. 6 fuel delivery is adjusted to optimal working conditions. 3 3 Mass Air Flow (MAF) Sensors 7 Downstream Oxygen Sensor A MAF sensor measures the exact amount of air 5 The downstream oxygen sensor monitors the efficiency of entering the vehicle’s engine. The sensor then 7 the catalytic converter and sends signals regarding how well transmits this information via an electrical signal the vehicle’s catalytic converter is working. to the ECU. 8 Catalytic Converter 4 Spark Plug Removes contaminants from the combustion system. The spark plug produces the spark that ignites 8 Without the correct air-fuel mixture provided by the the air-fuel mixture in the combustion chamber of ECM, the catalytic converter cannot eliminate harmful gasoline engines. pollutants from the exhaust gases.

Tune-up for Lower Emissions and Greater Fuel Economy

When to replace an oxygen sensor Side effects of a worn-out Benefits of replacing an Premium Planar Type Sensors reach operating temperature in half the time of thimble-type sensors, reducing emissions by over Exposure to carbon, soot, harmful gases, antifreeze, oxygen sensor oxygen sensor 50% during the cold-start phase. The multi-layer sensor element, chemicals and thermal and physical shock will shorten ffProduces excessive harmful exhaust emissions ffReduces harmful emissions with an integrated heater, delivers precise performance over a the life of an oxygen sensor. A worn sensor can result long performance life. ffWastes fuel ffSaves money in fuel costs in reduced gas mileage, poor engine performance and/ ffCauses engine performance problems, such as ffImproves engine performance or emissions test failure. surging and hesitating ffPrevents premature failure of the That’s why checking and — if needed — replacing a ffAccelerates catalytic converter damage catalytic converter worn-out oxygen sensor with a Bosch Premium Premium Thimble-type Sensors feature the Bosch patented Oxygen Sensor is an important part of every Platinum Power Grid made with more platinum for optimized routine tune-up. sensing and peak performance.

Prevents premature Improves engine Increases fuel Reduces harmful failure of the performance efficiency emissions catalytic converter