User:Larry Coulthard/sandbox

Oxygen Sensors Locations/Positions
It is a basic requirement that in order for the exhaust gas catalytic converter to work efficiently, the air/fuel ratio (AFR) in an engine’s combustion chamber must be controlled very accurately. It is for this task that an oxygen sensor plays an essential role. There are three oxygen sensor position names NTK Australia recommend for our vehicle applications:
 * Manifold (Exhaust) – Located on exhaust manifold, from engine cylinder head to flange split.
 * Pre-Cat (Pre-Catalytic Converter) – Located on exhaust pipe, from flange split to catalytic converter.
 * Post-Cat (Post-Catalytic Converter) – Located on exhaust pipe, from catalytic converter to intermediate muffler.

When servicing or repairing vehicle applications that contain multiple oxygen sensors, further information relating to the sensor positions may be required beyond the above three sensor positions. Below are additional position specific descriptions:


 * LH – Left-hand side, Passenger side of the vehicle
 * RH - Right-hand side, Driver side of the vehicle
 * Front – Sensor position closer to front of vehicle.
 * Rear – Sensor position closer to engine bay firewall.
 * Upper – Sensor position in higher position.
 * Lower – Sensor position in lower position.

The above oxygen sensor positions are used in all of major oxygen sensor distributor publications (paper catalogue, e-catalogues & website part finders).

Automotive Scantool Position Coding
There are four oxygen sensor position codes that aftermarket automotive scan-tools indicate for vehicle applications: Below is NTK’s oxygen sensor position match to automotive scantool coding:
 * B1 – Engine Bank 1
 * B2 – Engine Bank 2
 * S1 – Oxygen Sensor 1
 * S2 – Oxygen Sensor 2

Inline 4 & 6 Cylinder Engines (RWD, AWD & 4WD)

 * Sensor 1 ► Manifold / Pre-Cat
 * Sensor 2 ► Post-Cat

V6 Cylinder Engines (FWD)

 * Bank 1 - Sensor 1 ► Manifold / Pre-Cat-Rear
 * Bank 2 - Sensor 1 ► Manifold / Pre-Cat-Front
 * Bank 1 - Sensor 2 ► Post-Cat-Rear
 * Bank 2 - Sensor 2 ► Post-Cat-Front

V6 & V8 Cylinder Engines (RWD, AWD & 4WD)

 * Bank 1 - Sensor 1 ► Manifold / Pre-Cat-RH
 * Bank 2 - Sensor 1 ► Manifold / Pre-Cat-LH
 * Bank 1 - Sensor 2 ► Post-Cat-RH
 * Bank 2 - Sensor 2 ► Post-Cat-LH

Inline 4 & 6 Cylinder Engines (RWD, AWD & 4WD)
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 * Sensor 1 ► Pre-Cat Sensor
 * Sensor 2 ► Post-Cat Sensor

Inline 4 Cylinder Engine (FWD)

 * Sensor 1 ► Manifold Sensor
 * Sensor 2 ► Post-Cat Sensor

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V6 & V8 Cylinder Engines (RWD, AWD & 4WD)
________________________________________
 * Bank 1 - Sensor 1 ► Pre-Cat-RH Sensor
 * Bank 2 - Sensor 1 ► Pre-Cat-LH Sensor
 * Sensor 2 ► Post-Cat Sensor

V6 Cylinder Engine (FWD)
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 * Bank 1 - Sensor 1 ► Manifold-Rear Sensor
 * Bank 2 - Sensor 1 ► Manifold-Front Sensor
 * Sensor 2 ► Post-Cat Sensor

Inline 6 Cylinder Engines (RWD, AWD & 4WD)
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 * Bank 1 - Sensor 1 ► Manifold-Front Sensor
 * Bank 2 - Sensor 1 ► Manifold-Rear Sensor
 * Sensor 2 ► Post-Cat Sensor

V6 & V8 Cylinder Engines (RWD, AWD & 4WD)

 * Bank 1 - Sensor 1 ► Manifold-RH Sensor
 * Bank 2 - Sensor 1 ► Manifold-LH Sensor
 * Bank 1 - Sensor 2 ► Post-Cat-RH Sensor
 * Bank 2 - Sensor 2 ► Post-Cat-LH Sensor