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Standard - Just The Facts
Just The Facts
Accelerator Pedal Sensors
Air Charge and Manifold Temperature Sensors
Airbag Clock Springs
Anti Lock (ABS) Sensors
Anti Lock Brake (ABS) Sensors Testing
Barometric Pressure (BARO) Sensors
Brake Pad Wear Sensors
Camshaft and Crankshaft Position Sensors
Camshaft Synchronizer Assemblies
Coolant Temperature Sensors
COP Boot and Pigtail Socket Assortments
Daytime Running Light Kits
DIS Control Modules
Don't Get PO'ed with PO401 Codes
EGR Position and EGR Pressure Sensors
EGR Valves
Fuel Injectors
Fuel and Water Separator Sensor
Ignition Coil Testing
Ignition Coil on Plug (COP)
Knock (Detonation) Sensors
MAF (Mass Air Flow) Sensors
MAP (Manifold Absolute Pressure) Sensors
Oxygen (O2) Sensors
T Series Fuel Injector line addition
Throttle Position Sensors
Tire Pressure Monitoring (TPMS) Sensors
TPMS Service and Repair
Two or Four, That is the Question
Vehicle Speed Sensors
Vehicle Warning Lights
Water Intrusion and Premature Coil Failure (UF303)
YAW Rate Sensors
Oxygen (O²) Sensors

Oxygen (O²) Sensors
What does an Oxygen Sensor do?
The Oxygen or O2 sensor outputs a voltage between .1 volt and 1 volt based on the amount of oxygen in the exhaust.
The computer uses this rich or lean information to trim the air/fuel ratio for the most efficient operation.

Where are these sensors located?
The Oxygen sensor is located directly in the exhaust stream in the exhaust manifold.

Will a malfunctioning Oxygen Sensor illuminate the check engine light or affect vehicle operation?
Yes, a failing sensor can illuminate the MIL, and will cause the vehicle to have poor performance, poor mileage and possibly black smoke emitting from the tailpipe.

What are the common causes of failure?
Silicone entering the combustion chamber, oil and water leaks on the sensor or wiring can cause the sensor to fail. The O2 sensor internal heater can fail due to normal usage.

How to determine if these sensors are malfunctioning.
The Oxygen sensor can be monitored for proper voltage range and proper switching frequency with a scan tool. It is recommended that if the vehicle has an oxygen sensor in each exhaust manifold both sensors should be replaced when one has failed.

What makes Standard Oxygen Sensors the best.

  • One-piece laser welded body for maximum protection and precise operation maintaining sensor integrity
  • Dual internal talc seal makes Standard Oxygen sensors last longer
  • Breathable Teflon membrane allows increased air flow for a faster switch rate to improve fuel economy and save the motorist money at the pump
  • Stainless steel shield protects the element from thermal shock and regulates proper air flow to ensure faster sensor response and better performance


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