I have an 08 grand Prix the knock sensor has gone bad (bank 2) it's in between the engine and transmission, is it possible to replace it without removing the transmission?

P0306 PONTIAC - Cylinder 6 Misfire Detected https://www.autocodes.com/p0306_pontiac.html

P0141 PONTIAC - O2 Sensor Heater Circuit Malfunction Bank 1 Sensor 2
P0141 Pontiac O2 Sensor Heater Circuit Malfunction Bank 1 Sensor 2

Check engine light on ? What code ? There are many different (DTC'S) - diagnostic trouble codes that can set for knock sensors ! There all don't mean that you replace the sensor .
DTC P0324: Knock Sensor (KS) Module Performance
DTC P0325: Knock Sensor (KS) Circuit Bank 1
DTC P0326: Knock Sensor (KS) Performance
DTC P0327: Knock Sensor (KS) Circuit Low Bank 1
DTC P0328: Knock Sensor (KS) Circuit High Bank 1
DTC P0330: Knock Sensor (KS) Circuit Bank 2
DTC P0332: Knock Sensor (KS) Circuit Low Bank 2
DTC P0333: Knock Sensor (KS) Circuit High Bank 2

The knock sensor (KS) system enables the control module to control the ignition timing for the best possible performance while protecting the engine from potentially damaging levels of detonation. The sensors are located below each cylinder head on the engine block. The KS produces an AC voltage signal that varies depending on the vibration level during engine operation. The control module adjusts the spark timing based on the amplitude and the frequency of the KS signal. The control module receives the KS signal through 2 isolated signal circuits. The control module learns a minimum KS noise level at idle and uses calibrated values for the rest of the RPM range. The control module should monitor a normal KS signal within the noise channel.
Knock Sensor Replacement - Bank 1
Remove the exhaust manifold lower heat shield. Refer to Exhaust Manifold Lower Heat Shield Replacement.
Disconnect the engine wiring harness electrical connector (1) from the bank 1 knock sensor (2).
Loosen the knock sensor bolt and remove the knock sensor.
Knock Sensor Replacement - Bank 2
Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection .
Remove the engine oil filter. Refer to Engine Oil and Oil Filter Replacement .
Lower the vehicle.
Disconnect the engine wiring harness electrical connector (2) from the bank 2 knock sensor (3).
Loosen the knock sensor bolt and remove the knock sensor.

Knock sensors are on the side of the engine block under the intake manifold. Bank 2 would be the sensor closest to the transmission above the starter as I recall.

try your computer it is probably going bad

There are two of them, they are screwed into the engine blocks cooling water jacket (where the drain plugs would have gone for the block without sensors) below the spark plugs and cylinder heads on the front and rear of the engine. See picture below. One note knock sensors seldom fail, also if you do replace it it must be carefully torqued to the proper spec (12 foot lbs I think) or it will not work correctly and that can trigger a fault code once again.

my 1999 grand prix pontiac wont go in drive or reverse i drove it yesterday with no prolem today it wont move

engine code 43 - electronic spart timing problem- possible knock sensor problem.. check for 5v at knock sensor wire.. if it has 5v then probably need a knock sensor.

Standing in front of the car looking at the engine bank 1 is the cylinders on the front of the engine. These are cylinders 1-3-5. On the rear is bank 2 cylinders 2-4-6. The O2 sensor is located screwed into the exhaust manifold or the exhaust pipe on the front of the engine.

Bank 1 is the frt side exhaust manifold (did they say bank 1 sensor 1?),you can start by replacing that sensor,i would check the intake for leaks ,the gm 6cly. are known for bad intake gaskets,you will see oil coming out form the frt or rear of the intake,also check your atifreeze overflow bottle for bronwish sludge,which means that the oil is mixing with the antifreeze.A leaking intake could cause that lean condition.