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The IAC is used to maintain the speed of the engine while at idle. It regulates engine speed by precisely adjusting the amount of air allowed into the intake during idle.

A faulty idle air control valve may cause: Erratic idle Engine stall High idle

The throttle body is an essential part of the inlet air stream of a modern gasoline engine. In combination with the electronic throttle control system, the throttle body assembly is designed to control the amount of fresh air entering the engine.

A faulty throttle body could cause: Check engine light Poor fuel economy Engine hesitation Emission standards issues

A failed or failing air temperature sensor may exhibit a Check Engine Light, Hard Starting, Poor Performance, Decreased Fuel Economy, and Increased Harmful Emissions

A failed or failing liquid temperature sensor may exhibit a Check Engine Light, Sporadic Gauge Readings, Poor Drivability, Decreased Fuel economy, and Frequent Overheating

A failed or failing high pressure sensor may exhibit a Check Engine Light, Poor Performance and Driveability, Hard Starting with Fuel Pressure Sensor, and improper ABS function for brake system applications.

A failed or failing low pressure sensor may exhibit a Check Engine Light, Low Pressure Warning Light, Sporadic Gauge Readings, Poor Poor Driveability and Hard Starting with Fuel Pressure Sensors

Bosch offers Pressure sensors for many applications. Please use our Part Finder to see what sensor fits your vehicle.

Common rich burn sensors are 12028, 15718, 13190, and 15703. A common lean burn sensor is the 17025.

Common rich burn sensors are 12028, 15718, 13190, and 15703. A common lean burn sensor is the 17025.

The Rich Burn is a standard narrow band type oxygen sensor and are only capable of accurately measuring a stoichiometric air/fuel ratio (e.g. 14.7:1). The Lean Burn is a planar ZrO₂ two-cell limit current sensor with an integral heater suitable for measuring the oxygen content and the λ value of exhaust gases in vehicle engines.

All Bosch 4-wire sensors have a black wire for the signal, a gray wire for ground and 2 white wires for the heater. Note: the wire colors and functions on non-Bosch sensors are not necessarily the same as on Bosch sensors.

Bosch has created an aftermarket universal heated oxygen sensor program. These sensors meet OEM operating requirements and have a patented connector system easing installation. This connector system has been proven to be watertight, protect against contamination, and withstand the effects of extreme temperatures and engine vibration. Currently Bosch offers 12 different 4 wire sensors and 2 different 3 wire sensors to provide the closest match to OEM sensor performance. See the Technical Info tab for a diagram of the connector system, featuring special high temperature Posi-Lock® connectors.

Oxygen sensors have been standard equipment on almost all passenger cars and light trucks with gasoline engines since 1980-1981. Most vehicles built before the mid-90’s have one or two oxygen sensors (two were used on selected V6 and V8 engines starting in the late 1980s). Oxygen sensors are normally located in the exhaust system before the catalytic converter to measure exhaust emissions as they come from the engine combustion chambers. In 1996 with the federal mandated use of on-board-diagnostic systems (OBDII), vehicles also require additional oxygen sensors after the catalytic converter, to ensure that the converter is operating properly.

Yes! Bosch tests all oxygen sensors it manufactures by subjecting each of them to a 1,000 degree Celsius functional test and a leak test to ensure environmental and functional robustness. The 1,000 degree Celsius test sears the outer protection tube, but ensures 100% functional sensor performance.

An oxygen sensor can fail prematurely if it becomes contaminated with phosphorus from excessive oil consumption, silicone from internal coolant leaks, using silicone sealant in the engine and some over-the-counter fuel additives. Even a small amount of poorly refined gasoline can affect an oxygen sensor. Environmental factors such as road splash, salt, oil and dirt can also cause a sensor to fail – as can thermal shock, mechanical stress, or mishandling. However as required by vehicle manufacturers, Bosch sensors are designed and tested with these conditions in mind.

Unfortunately, the symptoms of a slow or even a dead sensor are not always obvious to the vehicle owner. Some symptoms of failed oxygen sensors are: Failed emissions test (high CO and/or HC typically) Damaged catalytic converter (caused by an over rich fuel mixture) Poor fuel mileage (caused by an over rich fuel mixture); engine runs rough Sluggish performance If the “check engine” light comes on while driving, check your oxygen sensor and, if necessary, replace it with a new premium Bosch Oxygen Sensor.

The oxygen sensor sends a signal to the engine computer (ECU) based on the amount of unburned oxygen in the exhaust. This signal is then read and used by the engine's ECU to adjust the air/fuel mixture entering the engine.

No, there are five fundamentally different types of oxygen sensors: unheated thimble, heated thimble, planar, wide-band and titania. Within each sensor type, sensors vary in the design of the ceramic element, heater element and protection tube design, all of which affect how the sensor operates.

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