Bosch is the world's leading supplier and original equipment manufacturer of Oxygen Sensors. Bosch invented the automotive oxygen sensor and leads the way in sensor technology and innovation. From overall sensor design to the critical ceramic element, Bosch is known worldwide for quality and performance.
Features & Benefits:
Double laser-welded stainless steel body protects against contamination
Seared protection tube due to 100% functional quality test
Pre-coated threads with anti-seize compound right out of the box
True Direct-fit OE connectors and harness
Engine Bank Identification
An OBD Scan Tool will usually identify Oxygen (O2) Sensors by the Bank Number (B1 = Bank 1; B2 = Bank 2) and Sensor Number (S1 = Sensor 1; S2 = Sensor 2, etc.). Bank 1 is not on the same side of the engine for every vehicle.
Bank 1 will always contain Cylinder 1. To locate Cylinder 1,
Check for cylinder labels on spark plug wires
Look for the cylinder that is closest to the front of the engine
Refer to your Repair Manual (Found under 'Literature')
Bank 2 refers to the bank opposite Bank 1
Sensor 1 refers to the sensor before the catalytic converter
(Other Terms: Upstream Sensor, Pre-Cat Sensor)
Sensor 2+ typically refers to the sensor(s) after the catalytic converter (Other Terms: Downstream Sensor, Post-Cat Sensor)
Common O2 Sensor Locations
Vehicle and part manufacturers sometimes use different terms than diagnostic tools to identify sensor positions. Regardless of the vehicle's engine orientation, the right or left bank is determined by viewing the engine from the rear (opposite the drive belts).
Upstream Sensor (Before Converter)
Downstream Sensor (After Converter)
Left or Front Upstream Sensor (Before Converter)
Right or Rear Upstream Sensor (Before Converter)
Common O2 Sensor Contaminants
Oxygen (O2) Sensors commonly fail due to contamination. When checking or replacing an O2 Sensor, visually inspect the sensor body to determine if it has been contaminated by a faulty part or substance upstream, and correct the fault before replacing the sensor.
Cracked or warped cylinder head
Leaking cylinder head gasket
Leaking intake manifold gasket
Antifreeze Poisoned O2 Sensor
Use of an improper silicone gasket sealant on the engine