Check engine light...C5

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Jul 22, 2008 | 02:01 AM

trbobusa

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Check engine light...C5...CODES FOUND!!

this damn thing is driving me nuts...when i start the car its not on, then drive for a while it comes on...next day same thing?? over and over...car runs fantastic even with it on...could it be maybe an O2 sensor? is there a way to pull the codes without going to the dealer..cause it always goes off when i take it to the dealer...damn car is possesed lol its a 1998 model

thanks
tim

Last edited by trbobusa; Jul 22, 2008 at 06:02 PM.

Jul 22, 2008 | 02:25 AM

lucky131969

Tech Contributor

Joined: Jan 2007

Posts: 19,246

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From: Dyer, IN

Quote:

Originally Posted by trbobusa

is there a way to pull the codes without going to the dealer..cause it always goes off when i take it to the dealer...damn car is possesed lol its a 1998 model

thanks
tim

I'm confused....the light goes off when you go to the dealer? They should still be able to pull up historical codes even if current ones don't exist.

Google is your friend....first search is on me:

http://www.c5forum.com/ayc/dtcdic.php

Jul 22, 2008 | 02:34 AM

trbobusa

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yes its possesed!! but i didnt want to go to the dealer and get raped when i know you guys here can help more than my idiot dealer...lol

thanks for the info...i will definately use the search from now on....so much info on this site...i may be up all night! will post any codes i find tomm

thanks again
tim

Jul 22, 2008 | 06:06 PM

trbobusa

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ok, i went out and got the codes from the display...most were history codes...i cleared all but only 2 codes would not clear

engine light went off but came back on after driving for a while.

P-0161 current
B-0333 current

these were the only codes that were current...any advice from you guys on whats needed to fix these problems? or am i gonna have to take it to the dealer?

thanks in advance
tim

Jul 22, 2008 | 06:41 PM

87SAM

Safety Car

Joined: Jan 2001

Posts: 4,385

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From: Boise ID

DTC P0161 HO2S Heater Performance Bank 2 Sensor 2
DTC B0333 Outside Air Temperature Sensor Open

Jul 22, 2008 | 06:54 PM

lucky131969

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Joined: Jan 2007

Posts: 19,246

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From: Dyer, IN

Quote:

Originally Posted by trbobusa

If you go back up to post #2, follow the link, and click the year at the bottom of the page, it will tell you what the code means. Everything else comes down to how comfortable you are working on your car.

Jul 22, 2008 | 06:59 PM

BlackZ06

Safety Car

Joined: Aug 2000

Posts: 4,933

Likes: 30

From: San Rafael CA

Quote:

Originally Posted by trbobusa

First, just because a code has a "H" status doesn't mean you can ignore it. Many DTC set to "H" status when you turn the engine off. You should look at ALL the codes when looking at a problem.

Second ....

P0161 HO2S Heater Perf Bank 2 Sensor 2

Your Heated O2 sensor is not performing correctly. This sensor measures how well your passenger side cat is performing .... it does not affect the car's driveability. Inspect the sensor for a wiring problem (wires melted to exhaust pipe, etc.) ...... but given the sensor is probably now 10 years old ... it probably needs replacement. This sensor is positioned behind the cat on the passenger side. It is GM part number 25312202 and list price is $212.03 .... but you can get it for a better price from forum supporting parts vendors. You can fix it yourself if you have a way to jack and support the car, and some basic tools.

Finally, the B0333 ..... your HVAC unit is showing a "false" outside air temperature .... most likely your outside air temperature sensor has failed, or the wiring to it is corroded or damaged.

Jul 23, 2008 | 12:58 AM

trbobusa

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o2 sensor i can fix, but the outside air temp sensor? how and where do i look to replace that?

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Jul 23, 2008 | 09:46 AM

jedblanks

Safety Car

Joined: Dec 2004

Posts: 3,526

Likes: 17

From: Santa Fe TX

outside air temp is not throwing the CE code. Fix the light first. Outside Air temp is under the front number I think. I think you can get to it from under the car.

I think mine was stuck through the air shroud on the pass side of the intake track, underneath the car. If you have an aftermarket intake, they may have put it somewhere else (and it may have come loose), but the harness is over near the pass side, behind/under the front bumper.