what does the code 402 mean in pontiac grand am gt 2002

Asked by buckey Nov 10, 2012 at 03:51 PM about the 2002 Pontiac Grand Am GT

Question type: Maintenance & Repair

I have changed both upstream and downstream o2 sensors and installed a new thermostat and then cleared the codes,, 2 days later service engine soon light light comes on with code 402...Could this be the catalytic converter ????    I hate to spend the cash if this is not it,, please help me if you can kevin k thankx

1 Answer
69,085

John answered 11 years ago

Let me guess auto zone told you that the code meant the O2 sensors were bad so they could sell you 2 $80 sensors? P0402 has nothing to do with a bad O2 sensor its caused by excessive egr flow and the link takes you to a site that will explain how to diagnose what exactly it is so you don't have to throw parts at it. http:// www.obd-codes.com/p0402 feel free to reply to this post if you need more help, I will get an email on my phone within 20 minutes of your reply and I will get to it once I have a few free minutes.

2 people found this helpful.
Mark helpful

Your Answer:

Related Questions

  • what does the code 402 mean in pontiac grand am gt 2002 1 Answer

    I have changed both upstream and downstream o2 sensors and installed a new thermostat and then cleared the codes,, 2 days later service engine soon light light comes on with code 402...Could this be t...

    2002 Pontiac Grand Am GT

    -

    Maintenance & Repair

  • 2002 Pontiac grand am gt 2 Answers

    2002 Pontiac grand am gt Please some one tell me why my car gets fire and cranks after putting in a starter , water pump , and battery but wont start , acts like it wants to but don't ?

    2002 Pontiac Grand Am GT Coupe

    -

    Maintenance & Repair

  • 2002 Pontiac grand am 2 Answers

    My 2002 Pontiac grand am runs rough and sounds like the exhaust is misfiring. There are slight delays and sounds like the exhaust skips. What are some issues it can be? I heard might need new spark...

    2002 Pontiac Grand Am SE

    -

    Maintenance & Repair

  • 2002 pontiac grand am gt v6 2 Answers

    I need to know why does my car get hot plz help

    2002 Pontiac Grand Am GT

    -

    Maintenance & Repair

  • The secruity light is on in my '99 Grand Am. What does that mean? 8 Answers

    I parked my 1999 Grand Am in my driveway and I tried to move it about 20 minutes later to allow more room in my driveway and the car just wouldn't start. It acts like it is going to and iit turns over...

    1999 Pontiac Grand Am 4 Dr SE Sedan

    -

    Maintenance & Repair

Shortcuts

Search Pontiac Grand Am Questions

CarGurus Experts

  • #1
    tenspeed
    Reputation
    10,970
  • #2
    james sparrow
    Reputation
    2,360
  • #3
    John Saffrahn
    Reputation
    2,280
View All

Find great deals from top-rated dealers

Search

Related Models For Sale

Used Pontiac Grand Prix
3 listings
Used Pontiac Firebird
18 listings
Used Toyota Camry
50 Great Deals out of 1,096 listings starting at $2,500

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use. Content will be removed if CarGurus becomes aware that it violates our policies.