Features & Specifications:
Compatibility:
1998 2000 Buick Century 3.1L
1997-2003 Buick LeSabre 3.8L
1998 2003 Buick Park Avenue 3.8L
1999-2001 2003 Buick Regal 3.8L
1998 Buick Riviera 3.8L
1997-1999 Cadillac DeVille 4.6L
1997-1998 Cadillac Eldorado 4.6L
1996-1997 Chevrolet Astro 4.3L
1996-1997 Chevrolet C1500 4.3L
1996-1997 Chevrolet C1500 5.0L
1996-1998 Chevrolet C1500 5.7L
1996 1999 Chevrolet C1500 Suburban 5.7L
2000 Chevrolet C2500 5.7L
1997 Chevrolet C2500 7.4L
1998-2000 Chevrolet C3500 5.7L
1996 2000 Chevrolet C3500 7.4L
2000 Chevrolet Express 1500 4.3L
1997 1999 2001 Chevrolet Express 1500 5.7L
2001 Chevrolet Express 2500 4.3L
1997 2000 Chevrolet Express 2500 5.0L
2000 Chevrolet Express 2500 5.7L
1997 1998 2000 2002 Chevrolet Express 3500 5.7L
2000 Chevrolet Express 3500 7.4L
2002 Chevrolet Impala 3.8L
1997 Chevrolet K1500 4.3L
1996 Chevrolet K1500 5.0L
1996-1999 Chevrolet K1500 5.7L
1996-1999 Chevrolet K1500 Suburban 5.7L
1998-2000 Chevrolet K2500 5.7L
1999 Chevrolet K2500 Suburban 7.4L
1998-1999 Chevrolet K3500 7.4L
1998 Chevrolet Lumina 3.1L
1998-2000 Chevrolet Malibu 3.1L
2000-2003 Chevrolet Monte Carlo 3.8L
1999 Chevrolet P30 5.7L
1999-2002 Chevrolet Silverado 1500 4.3L
2000-2002 Chevrolet Silverado 1500 4.8L
1999-2001 Chevrolet Silverado 2500 6.0L
2001 Chevrolet Silverado 2500 HD 6.0L
2000-2001 Chevrolet Suburban 2500 6.0L
1996-2000 Chevrolet Tahoe 5.7L
1999-2000 Chevrolet Venture 3.4L
1997 GMC C1500 4.3L
1996 1997 GMC C1500 5.7L
2000 GMC C3500 5.7L
1996-1998 GMC K1500 5.7L
1999 GMC K1500 Suburban 5.7L
1997 GMC Safari 4.3L
1997 GMC Savana 1500 5.7L
2002 GMC Savana 2500 5.7L
2002 GMC Savana 3500 5.7L
2000 GMC Sierra 1500 4.3L
2000 GMC Sierra 2500 6.0L
1997-1999 GMC Yukon 5.7L
2001 GMC Yukon 6.0L
1998-1999 Oldsmobile 88 3.8L
2000 Oldsmobile Alero 3.4L
1998 Oldsmobile Intrigue 3.8L
1998 2000 2002 Pontiac Bonneville 3.8L
1997 Pontiac Firebird 3.8L
1999-2000 Pontiac Grand Am 3.4L
1997-2003 Pontiac Grand Prix 3.8L
2000 Pontiac Montana 3.4L
1998 Pontiac Trans Sport 3.4L
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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