Features & Specifications:
Compatibility:
2005 Cadillac CTS 2.8L
2004-2006 Cadillac SRX 4.6L
2005-2006 Cadillac STS 4.6L
2004-2005 Cadillac XLR 4.6L
2006-2008 Infiniti FX45 4.5L
2006-2010 Infiniti M45 4.5L
2006 Infiniti Q45 4.5L
2004-2006 Infiniti QX56 5.6L
2004-2006 Nissan Altima 3.5L
2005-2006 Nissan Armada 5.6L
2005-2006 Nissan Frontier 4.0L
2004-2008 Nissan Maxima 3.5L
2004-2007 Nissan Murano 3.5L
2005-2006 Nissan Pathfinder 4.0L
2004-2009 Nissan Quest 3.5L
2000-2002 Nissan Sentra 1.8L
2004-2006 Nissan Titan 5.6L
2005-2006 Nissan Xterra 4.0L
2000-2002 Subaru Forester 2.5L
2000-2002 Subaru Impreza 2.5L
2000-2002 Subaru Legacy 2.5L
2000-2002 Subaru Outback 2.5L
location:Upstream: location is between the catalytic converter and the engine
Downstream: location is between the catalytic converter and the tailpipe
Oxygen Sensor Q & A
1.How are the oxygen sensors identified on a scan tool?
When displayed on a scan tool, the right and left upstream oxygen sensors are typically labeled Bank 1, Sensor 1 and Bank 2, Sensor 1. The Bank 1 sensor will always be on the same side of a V6 or V8 engine as cylinder number one.
On a scan tool, the downstream sensor on a four or straight six cylinder engine with single exhaust is typically labeled Bank 1, Sensor 2. On a V6, V8 or V10 engine, the downstream O2 sensor might be labeled Bank 1 or Bank 2, Sensor 2. If a V6, V8 or V10 engine has dual exhausts with dual converters, the downstream O2 sensors would be labeled Bank 1, Sensor 2 and Bank 2, Sensor 2. Or, the downstream oxygen sensor might be labeled Bank 1 Sensor 3 if the engine has two upstream oxygen sensors in the exhaust manifold (some do to more accurately monitor emissions).
It's important to know how the O2 sensors are identified because a diagnostic trouble code that indicates a faulty O2 sensor requires a specific sensor to be replaced. Bank 1 Sensor 1 might be the back O2 sensor on a transverse V6, or it might be the one on the front exhaust manifold. What's more, the O2 sensors on a transverse engine might be labeled differently than those on a rear-wheel drive application. There is not a lot of consistency as from one vehicle manufacturer to another as to how O2 sensors are labeled, so always refer to the OEM service literature to find out which sensor is Bank 1 Sensor 1 and which one is Bank 2 Sensor 1. This information can be difficult to find. Some OEMs clearly identify which O2 sensor is which but others do not. If in doubt, call a dealer and ask somebody in the service department.
2.What's the difference between a "heated" and "unheated" oxygen sensor?
Heated oxygen sensors have an internal heater circuit that brings the sensor up to operating temperature more quickly than an unheated sensor. An oxygen sensor must be hot (about 600 to 650 degrees F) before it will generate a voltage signal. The hot exhaust from the engine will provide enough heat to bring an O2 sensor up to operating temperature, but it make take several minutes depending on ambient temperature, engine load and speed. During this time, the fuel feedback control system remains in "open loop" and does not use the O2 sensor signal to adjust the fuel mixture. This typically results in a rich fuel mixture, wasted fuel and higher emissions.
By adding an internal heater circuit to the oxygen sensor, voltage can be routed through the heater as soon as the engine starts to warm up the sensor. The heater element is a resistor that glows red hot when current passes through it. The heater will bring the sensor up to operating temperature within 20 to 60 seconds depending on the sensor, and also keep the oxygen sensor hot even when the engine is idling for a long period of time.
Heated O2 sensors typically have two-three or four wires (the extra wires are for the heater circuit). Note: Replacement O2 sensors must have the same number of wires as the original, and have the same internal resistance.
The OBD II system also monitors the heater circuit and will set a trouble code if the heater circuit inside the O2 sensor is defective. The heater is part of the sensor and cannot be replaced separately, so if the heater circuit is open or shorted and the problem is not in the external wiring or sensor connector, the O2 sensor must be replaced.
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