slayerized6

iTrader: (12)

title says it all. got a P0327 code (Knock Sensor 1, circuit Low Input, Bank 1 or 1 Sensor).

where exactly is it located? What does it look like?

jmm98LS1

iTrader: (28)

There are two knock sensors. They are both located in the valley cover underneath the intake manifold (you must remove the intake to access them).

slayerized6

iTrader: (12)

under the intake manifold? other threads say its behiind the intake by the firewall. please someone!!

2001NBMZ28

They're both under the intake manifold, I'd replace both while it's off if you need to replace it.

slayerized6

iTrader: (12)

damn. how long does it take to remove the manifold?

SSkillz

iTrader: (22)

Took me bout a hour but now i can take it off in about 20 mins

2001NBMZ28

It's not really that hard, check out the intake swap on ls1howto.com and ignore what you don't need.

slayerized6

iTrader: (12)

ok doesnt seem too hard. i was hoping for an easier install but oh well. the price i pay for owning an ls1

9000th01ss

iTrader: (10)

They usually fail because water gets in the wells where they are. There is a GM TSB that says to apply silicone to the boots and to create a dam to block water.
I did this on my car.

LS1CALIBOY

iTrader: (13)

I had one replaced already and my mechanic said there's one on the top of the motor and one at the bottom...are you sure there both under the intake?

BIG_MIKE2005

iTrader: (116)

Both knock sensors are under the intake manifold. If you remove the intake you cannot miss them. They are plain as day. At least on 98-02' LS1 motors anyway. I'm not sure on the 02'+ blocks.

staringback05

iTrader: (8)

there both under the manifold...becareful with the pigtail end on the wire, due to the heat the plastic tends to become brittle...

9000th01ss

iTrader: (10)

I'm not sure to be honest, you never said you had an LS1 or even a GM car for that matter.
Your mechanic is a dumbass, he already changed ONE? If you do have an LS1 and this is the same mechanic that did the last one, well I don't know what kind of **** he's trying to pull.

See the two black circles? they are boots that cap the wells where the sensors are. We just need to figure out what kind of car you're working on, or whats wrong with your mechanic.