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I have a 1999 firebird v6 and have the codes p0452 and p0449 they are both persistent codes but the p0452 comes up first, anyone know a fix?

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All you have to do is Google your codes & read up

TYPE: OBD PO452 etc

You know what the fix is

Go to a repair shop & have them smoke test the Evap
System,find all the problems & make the required repairs

Be a good idea to find a repair shop, like you find a doctor

Before you need one

Posted on May 15, 2014


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Posted on Jan 02, 2017

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SOURCE: how do you fix the timing on an 99' firebird v6?

check all vacuum lines clean fuel injectors.if it has been a while replace plugs and wires.also change fuel filter and air filter.

Posted on May 16, 2009

  • 401 Answers

SOURCE: P0449 code: couldn't get an inspection due to

p0449 is a EVAP code here is something to check had a few of these inspect the wiring harness coming out of the right rear floor pan area at connector The harness is located in front of the EVAP canister, and will usually show signs of wear. Make sure that you inspect all the wiring carefully and make all necessary repairs
hope this helps

Posted on Jan 17, 2010

  • 144 Answers

SOURCE: 1987 pontiac firebird, does anyone know how to fix dash lights.?

you have to take out the gauges, they will be on the back. In some cases you have to take apart most of the dash to get the instrument panel out, sometimes you can just take the trim off the instrument panel. I had to take apart most of my dash in my 86.

Posted on Jan 25, 2010

  • 262 Answers

SOURCE: Getting codes P0455 and P0449. From what I read,

The vent solenoid valve has been redesigned to correct the problem you are having. I would recommend purchasing the dealer component.
I am not aware of any aftermarket parts suppliers.

Posted on Feb 25, 2010

  • 10 Answers

SOURCE: 1999 pontiac firebird misfire

Misfire is caused by one of three things. Spark, Fuel or Air. Here's a seperate post that will get you started in looking in the places->

Cheapest place to start... CD2 Oil Detergent. See other post for instructions.

Second cheapest place to start. Change Plugs and Wires.

For teh rest.. look at other post.

Posted on Feb 27, 2010

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How do you fix the timing on an 99' firebird v6?

check all vacuum lines clean fuel injectors.if it has been a while replace plugs and wires.also change fuel filter and air filter.

May 14, 2009 | 1999 Pontiac Firebird

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