DTC Codes on my 02 Tahoe

R

rickp1

New member
Oct 29, 2012
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I ran my AutoCal the other day to look up my error codes and the AC came up with 3 of them.
P0135, Upstream O2 Sensor (left cylinder bank) heater performance
P0327 Knock Sensor signal freq outside normal range
P0332 Knock Sensor signal freq outside normal range

According to the Haynes manual, the 02 sensor has a feature were it allows the sensor to heat up so it can do its thing. I think that's what wrong with mine. Being that it's the heater performance I dont belive its affecting the air fuel mixture, but I might be wrong about that. Either way I'm planning on replacing them both just to be safe. Anything I should know about doing this?

My concern is the other 2 codes. I thing my Tahoe has 2 knock sensors. I don't think the engine is knocking or doing anything weird, at least I can't hear anything obvious, so I think the actual sensors are bad.

So my question is, how difficult is getting to the sensors to replace them. The Haynes manual has me removing the intake manifold, and to be honest I'm a bit intimidated by that. Are there any considerations In should know about if I decide to do this?
Is there a gasket that needs to be replaced when removing the manifold?

Thanks
R
 
the upstream O2 is important, change it or your proformance and gas mileage will be shit

secondly, the knock sensors are pretty easy, you just need to pull the plastic upper intake off, make sure you use lots of silcone when installing and always do both.

before changing the knock sensors, make sure you didnt get a bad batch of gas, try to run it out of that tank, and get good gas from somewhere trusted clear the code and see if they come back.
 
Ginger said:
the upstream O2 is important, change it or your proformance and gas mileage will be shit

secondly, the knock sensors are pretty easy, you just need to pull the plastic upper intake off, make sure you use lots of silcone when installing and always do both.

before changing the knock sensors, make sure you didnt get a bad batch of gas, try to run it out of that tank, and get good gas from somewhere trusted clear the code and see if they come back.
Click to expand...

Thnanks Ginger. Its not the gas, these sensors have been bad for a while. Let me ask you, you mentioned silicone. where do I put the silicone. I found one bulletin showing. It said around the outer edge of the ridge of the knock sensor. Is that were you out it?

Thanks

R.
 
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