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

Asked by 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

36,275

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.

1 of 1 people found this helpful.

Your Answer

Pontiac Grand Am Experts

  • #1
    tenspeed
    Reputation
    8,000
  • #2
    John Saffrahn
    Reputation
    1,630
  • #3
    Tom Demyan
    Reputation
    1,620
View All

Related Models For Sale

Used Pontiac Grand Prix
10 Great Deals out of 2,358 listings starting at $1,900
Used Pontiac Firebird
5 Great Deals out of 694 listings starting at $3,911
Used Ford Mustang
342 Great Deals out of 41,800 listings starting at $1,488
Used Chevrolet Camaro
371 Great Deals out of 31,504 listings starting at $3,000
Used Chevrolet Impala
483 Great Deals out of 31,772 listings starting at $1,000
Used Chevrolet Malibu
983 Great Deals out of 53,482 listings starting at $1,599
Used Pontiac Bonneville
397 listings starting at $1,995
Used Toyota Camry
1,115 Great Deals out of 77,076 listings starting at $1,100
Used Honda Civic
584 Great Deals out of 52,614 listings starting at $999
Used Honda Accord
790 Great Deals out of 89,573 listings starting at $1,444

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.