I need instructions on how to replace an oxygen sensor (Bank 1, Sensor 2) on a 2000 pontiac grand am se 4 cylinder, also what tools are need to perform the replacement
In some areas a basic 22mm wrench can be used, but if the area is tight you will need a oxygen sensor socket. It's a basic socket but has a cut down the side for the wires to fit into. Open the hood, look down at what is the manifold. You may have a piece of metal covering the sensor which is a heat shield, this will have to be removed. You will see the sensor screwed into the exhaust manifold, follow the wires where it plugs into adapter. Unplug the sensor and with it being the front sensor you should be able to use the 22mm wrench and loosen. It's best to warm the engine a little for easier removal and thread damage. Once you remove the sensor, be sure the new one has anti seize grease on the threads, this keeps the part from welding itself to the exhaust. I work for Bosch, and operate the line that produces these, so my advice is to buy the aftermarket because it's the same as the OEM. Goodluck
HO2S-11 (Bank 1 Sensor 1) Insufficient Activity
Possible Causes:
HO2S heater is damaged or has failedHO2S signal or ground circuit has a high resistance conditionHO2S signal circuit is open or shorted to system power (B+)HO2S has failed (i.e., it is silicon, water or fuel contaminated)PCM has failed.Sounds like you need a new oxygen sensor,Bank 1 Sensor 1 is located on the exhaust manifold, closest to the front.Here's a link to the firing order,bank one is cylinder one side.Here's the part you need,here's how to replace.
Fig. Fig. 3: Oxygen sensor-4.3L engines
Fig. Fig. 4: Oxygen sensor-5.0L and 5.7L engines
Fig. Fig. 5: Oxygen sensor-7.4L engines
Oxygen sensors are always numbered like this:
Bank 1 sensor 1
Bank 2 sensor 1
Bank 1 sensor 2
Bank 2 sensor 2
Some manufacturers use a kind of shorthand that reads different, but means the same thing:
Sensor 1/1 or O2s 1/1
Sensor 2/1 or O2s 2/1
Sensor 1/2 or O2s 1/2
Sensor 2/2 or O2s 2/2
Bank 1 is always the side of the engine where cylinder number 1 is located and, of coarse, Bank 2 is the opposite side.
On a 4 cylinder engine, there is only 1 bank and it is always referred to as Bank 1.
Sensor 1 is always the upstream sensor (the one located BEFORE the catalytic converter)
Sensor 2 is always the downstream sensor (the one that is located AFTER the catalytic converter.
Hope helps (remember to rate this).
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