WHAT DOES YOUR LAMBDA SENSOR DO?

The lambda sensor is a device which determines the lambda content of the exhaust gas. Since the
amount of lambda in the exhaust gas is a very good indicator of combustion efficiency, it is also the best place to monitor the air fuel ratio.

WHERE IS YOUR LAMBDA SENSOR LOCATED?

Lambda sensors are located on the exhaust pipe(s). They are screwed into
the exhaust pipe via a bung. Each car generally has 1 lambda sensor located
before and after the catalytic converter. For engines with multiple banks, there will be an lambda sensor before and after the catalytic converter in each bank.

WHY DO LAMBDA SENSORS FAIL?

Lambda sensors can fail when the sensor’s ceramic element is exposed to certain types of silicone
compounds or when an oil-burning engine leads to the sensor becoming oil-fouled. Also, a small
amount of tetra-ethyl lead in the gasoline can kill an lambda sensor. Over-the-counter fuel additives, which are not “lambda sensor safe” can also kill an lambda sensor.

HOW DO YOU KNOW YOUR LAMBDA SENSOR IS FAULTY OR FAILING?

Symptoms of a failing lambda sensor are surging, hesitation, poor overall performance, falling fuel
mileage, rough idling, a failed emissions test, and an inefficient or clogged catalytic converter.

HOW TO DIAGNOSE A FAULTY OR FAILING LAMBDA SENSOR

Oxygen sensors can be difficult to diagnose quickly. Please refer to our Oxygen Sensors 101 information booklet for detailed information on how to properly test and diagnose an lambda sensor. Ask our Customer Service Team or visit our website for more details.

WHY CHOOSE WALKER PRODUCTS LAMBDA SENSORS?

Walker Products offers the most intelligent O2 program in the industry. Now, you can rely on Walker O2s for guaranteed performance, inventory solutions, and increased category performance.