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A Bosch Switching-Type Oxygen (O2) sensor uses a zirconia Nernst cell ceramic element to measure the oxygen content in exhaust gases. As the air-fuel mixture shifts between rich and lean, the sensor rapidly switches its voltage output. These fast transitions provide the ECU with real-time lambda data, allowing precise fuel adjustments for stable combustion, effective catalytic converter operation, and reduced emissions.
Modern EPA and Euro 6 emissions standards demand accurate air-fuel-ratio control to ensure clean and efficient combustion. Oxygen (O2) sensors supply the ECU with continuous lambda information, enabling proper catalytic converter function, reduced fuel consumption, and minimized harmful emissions across all operating conditions.
An Oxygen (O2) sensor should be replaced if a check-engine light appears and diagnostic trouble codes related to fuel-trim or sensor performance are stored, or if symptoms such as poor fuel economy, failed emissions tests, rough idle, or sluggish acceleration occur. Sensors contaminated by oil, coolant, fuel additives, or physical damage should also be replaced to restore accurate air-fuel-ratio control.
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It’s been more than 40 years since Bosch invented the Oxygen Sensor and began series production in 1976. That same year, the Volvo 240/260-series became the first passenger car equipped with the new Bosch sensor. From there, production grew steadily and the Oxygen Sensor became an essential tool for fuel efficiency and the reduction of CO2 emissions. To date, Bosch has produced 1 billion Oxygen Sensors. It took 32 years – from 1976 to 2008 – to reach the production record of 500 million pieces, but only eight years – from 2008 to 2016 – to double the production figures to 1 billion sensors. Bosch Oxygen Sensors continue to lead the market with their high-quality reputation; an attribute that has defined Bosch since its inception.
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Solving a vehicle with poor gas mileage and a check engine light on
We’ll take a look at a vehicle that has a check engine light on and has been getting poor gas mileage by utilizing a Bosch ADS 525X or ADS 625X Diagnostic Scan Tool, Bosch VET 100 Circuit Analysis Tool and a Bosch Direct Fit Oxygen Sensor. See how #BoschSolves real-world problems technicians see in their shop every day.