Replace an O2 Sensor on a 2004 GMC Motor lorry
The 2004 GMC Sierra Motor lorry has various Oxygen or O2 sensors in the action. On the V8 engine equipped trucks, there is one in Everyone exhaust tube in front of the catalytic converter too as one on the down drainpipe outlook from the exhaust manifold. When determining provided you longing to pocket money an Oxygen sensor, you occasion to notice which one of the sensors is defective so you can alternate the honest one. This break Testament be stored in the Motor lorry's personal computer, so keep it scanned before you modify the sensors. Most Car parts stores Testament end this for you clear.
Instructions
1.4. Place an O2 sensor socket on the O2 sensor in the exhaust pipe. If you do not have one, you can buy an O2 sensor socket at most auto parts stores.
Fix the Oxygen sensor you intend to replace. Whether it is the upstream sensor, find it under the engine in the down tube that runs from the exhaust manifold to the catalytic converter. If it is a downstream sensor, it is in the exhaust pipe just in front of the catalytic converter. On dual exhaust trucks, there are two downstream sensors on in each pipe.
3. Locate the wiring harness pigtail coming out of the top of the O2 sensor. Follow the wires up to the electrical connector at the vehicle wiring harness. Disconnect the connector by pushing down the locking tab on the connector and pulling the two halves of the connector apart.
Position a jack under the front suspension of the Motor lorry and hoist it off the ground. Position a fix of jack stands under the front suspension or frame rails to cornerstone the Motor lorry, then lower the jack and remove it from under the Motor lorry.2. Using a 3/8-inch drive ratchet, turn the socket counterclockwise, loosening the sensor. Lift the old sensor out of the pipe and discard it.
5. Thread the new O2 sensor into the hole in the pipe by hand to avoid stripping or cross threading fit. Tighten it with the O2 sensor socket and ratchet, then run the wiring harness pigtail up to the connector on the truck. Push the connector on the O2 sensor into the wiring harness connector, making sure the locking tab engages. Repeat this process for each O2 sensor that you need to change.
6. Position your jack under the front of the truck again and lift the truck off the jack stands. Remove the stands from under the truck and carefully lower the truck to the ground.
