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DTC Codes on my 02 Tahoe

rickp

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rickp Enthusiast

rickp

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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

rickp Enthusiast

rickp

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Posted

servbulletin.pdf

 

knocksensor.pdf

 

intake.pdf

 

Here's some info to help you out....never tried to attach PDF files to a post before so I hope it works.

 

 

Bossier,

thanks, I was able to download all the files with no issues.

I orderde all the parts I need to replace the knock sensors and the O2 sensor as well. I also got a new gasket for the TB.

I just hope murphy keep busy with someone else that day. LOL

 

Again thanks guys.

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