Faulty Oxygen Sensor Symptons

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What are the symptons of a failed O2 Sensor or Oxygen sensor?

The oxygen sensor eventually needs to be replaced in all vehicles as a matter of routine maintenance however there are signs you should look for to diagnose a faulty sensor.

The oxygen sensor, O2 sensor or Lambda Sensor plays an important role in monitoring the oxygen content of the car’s exhaust system. It determines the optimal mixture of air to fuel ratio needed to run the vehicle. A defective sensor can greatly increase your vehicle running costs because it allows the vehicle to use more fuel than what it should. Faulty sensors need to be diagnosed and replaced promptly. There are often 2 fitted or more O2 sensors fitted to most modern vehicles.

The symptoms of a faulty O2 sensor starts with sudden decrease in vehicle’s fuel efficiency.  A defective sensor makes the air-fuel mixture to run too rich or too lean resulting in poor fuel economy.
A defective oxygen sensor may also shows up as a check engine light and fault codes  P0030,  P0031,  P0032,  P0036,  P0037,  P0038,  P0040,  P0041,  P0042,  P0043,  P0044,  P0050,  P0051,  P0052,  P0053, P0054, P0055, P0056, P0057, P0058, P0059, P0130, P0131, P0132, P0133, P0134, P0135. P0136, P0137, P0138, P0139, P0140, P0141, P0142, P0143, P0150, P0151, P0152, P0153, P0154, P0155, P0156, P0157, P0158, P0159, P0160, P0161, P0170, P0171, P0172, P0173, P0174, P0175 to name a few.

The most accurate diagnosis of a defective oxygen sensor can be done using an OBDII code checker. The OBDII code checker is capable to identifying the defects in the exhaust system of the car including identify a fault oxygen sensor. Please note that only cars made in 1996 and after are equipped with OBDII interface. OBDII code reader will generate a diagnostic trouble code that can indicate with specific oxygen sensor has gone bad. 
Emission, Smog or MOT test failures can also be an indication of a failed oxygen sensor. 

Since a proper functioning oxygen sensors are vital for the optimal fuel consumption in the car, its best to replace the faulty sensor when in doubt.

Auto Sensors sell a large range  of Oxygen sensors to Australia, New Zealand and worldwide.  Click your vehicle brand for a link to sensors for your car
Subaru,
Toyota,
Nissan,
Mitsubishi,
Mazda,
Honda,  
BMW,
Holden,
Ford,
Suzuki,
VW,
Land Rover,
Other
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