We remove the sensors with the ignition off.
To remove the oxygen concentration control sensor…
…we disconnect or cut the clamp that secures the sensor wiring harness to the upper radiator hose of the cooling system.
By pressing the locking device of the engine management system wiring harness connector…
…disconnect the wiring harness connector from the sensor wiring connector.
Using a 22 mm spanner, unscrew the oxygen concentration control sensor (for clarity, shown on a dismantled exhaust manifold)…
…and remove the sensor.
To remove the oxygen concentration diagnostic sensor…
...by squeezing the "paws" of the sensor wiring harness retainer with pliers, we remove the retainer from the hole in the mudguard of the engine compartment.
Similarly, we remove the clamp of the oxygen concentration sensor wiring harness block from the hole in the bracket of the lower radiator frame.
By pressing the locking device of the engine management system wiring harness connector…
…disconnect the engine management system wiring harness connector from the sensor wiring harness connector.
Using a 22 mm wrench, unscrew the diagnostic oxygen concentration sensor…
…and remove the sensor.
We install oxygen concentration sensors in reverse order.
Before installing the sensors, apply a graphite-based anti-seize high-temperature lubricant to their threaded portion, such as ANTI-SEIZE LUBRICANT from Permatex.
Do not allow grease or dirt to enter the sensor wire connectors or into the sensors through the holes in their tips
[Original version of the article on the website: CHEVYMAN]