2008 Cadillac STS Spark Plug

The procedure is to install the oil pan drain plug and new O-ring seal, lower the vehicle, install the new Oil Filter cartridge, lubricate the oil filter cap threads with clean engine oil, install the oil filter cap, install the oil fill cap, fill the engine with the appropriate oil type and quantity, install the front compartment sight shield as necessary.

Contamination of the Oxygen Sensor can result from the use of an inappropriate RTV sealant (not oxygen sensor safe) or excessive engine coolant or oil consumption. Remove the HO2S and visually inspect the portion of the sensor exposed to the exhaust stream to check for contamination. If contaminated, the portion of the sensor exposed to the exhaust stream will have a white powdery coating. Silicon contamination causes a high but false HO2S signal voltage (rich exhaust indication). The control module will then reduce the amount of fuel delivered to the engine, causing a severe driveability problem. Eliminate the source of contamination before replacing the oxygen sensor.

To avoid being burned, you should not remove the Radiator Cap or surge tank cap while the engine is hot. The cooling system will release scalding fluid and steam under pressure if the radiator cap or surge tank cap is removed while the engine and radiator are still hot.