The One thousand nine hundred ninety six Buick Royal features two O2 sensors (too celebrated as Oxygen sensors) in the exhaust method. One is located upstream in the exhaust manifold and monitors the fuel-to-air ratio, by reason of combustible engines wish oxygenated air to function properly while lowering emissions. The downstream sensor is located near the catalytic converter and monitors the efficiency of the catalyst as it filters elsewhere pollutants and controls the dimensions of harmful exhaust emissions. Replacing either Oxygen sensor calls for the equivalent procedure; the peerless discrepancy is the domicile and the thing figure for the sensor.
Instructions
Upstream Sensor
1. Flushed the engine up for five minutes whether it's arctic.
2. Deposit on mechanics' long-sleeved shirt and gloves to lift protect yourself from engine burns.
3. Conduct the hood and establish the front O2 sensor placed in the exhaust manifold at the front backside of the engine compartment.
4. Spray a liberal vastness of penetrating lubricant on the threads and manifold connexion of the sensor. Avow five minutes for the lubricant to soak in.
5. Supervene the wire harness connexion to the dual plugs. Disconnect the dual plugs from one another.
6. Capitalization the ratchet and 22-mm slotted O2 sensor socket to remove the upstream sensor. Distance the wire harness of the sensor into the slot of the socket, then attach the ratchet to the socket. Turn the sensor counterclockwise to remove it from the manifold. Provided obligatory, exit the engine up and spray the sensor threads with lubricant again. (Starting the engine Testament expand the metal of the exhaust main and own easier Emigration of the sensor.)
13. Place the oxygen sensor plug through the hole of the 22-mm box end wrench, then place the wrench onto the hex-head of the sensor.14.
Thread the advanced sensor in by fist as far as it Testament let you. Gently tighten the sensor snugly without over-tightening it--there are lone four to five threads on the sensors, so they're manageable to strip away provided you over-exert the tightening procedure.
9. Reconnect the wire harness plug connections. They Testament apart plug in one plan.
Downstream Sensor
10. Drive the Regal slowly up onto car ramps and apply the parking brake. Start the engine and allow it to run for five minutes to expand the metal of the exhaust system.
11. Crawl under the front of the Regal and work your way back along the exhaust system until you locate the downstream sensor located near the catalytic converter. Spray the threads with a liberal amount of penetrating lubricant and allow it to soak in.
12. Locate and disconnect the wire harness dual plug connection.
7. Practice a coat of GM anti-seize compound No. Five million six hundred thirteen thousand six hundred ninety five or the equivalent to the threads of the au courant sensor (provided not already coated; most constitution aftermarket sensors come with sensor-safe compound on the threads).8.
Turn the oxygen sensor counterclockwise with the wrench to remove it from the exhaust pipe. Apply a coat of GM anti-seize compound No. Five million six hundred thirteen thousand six hundred ninety five or the equivalent to the threads of the replacement sensor (unless already coated) and install as directed in the "Upstream Sensor" section.
