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

35,675

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
    7,890
  • #2
    John Saffrahn
    Reputation
    1,610
  • #3
    Tom Demyan
    Reputation
    1,590
View All

Related Models For Sale

Used Pontiac Grand Prix
13 Great Deals out of 2,661 listings starting at $1,750
Used Pontiac Firebird
8 Great Deals out of 764 listings starting at $2,995
Used Chevrolet Impala
578 Great Deals out of 34,544 listings starting at $900
Used Chevrolet Malibu
1,034 Great Deals out of 62,796 listings starting at $880
Used Chevrolet Camaro
456 Great Deals out of 31,824 listings starting at $1,450
Used Ford Mustang
602 Great Deals out of 39,738 listings starting at $1,988
Used Pontiac Bonneville
480 listings starting at $2,995
Used Honda Accord
1,111 Great Deals out of 74,387 listings starting at $1,100
Used Chevrolet Cavalier
809 listings starting at $1,695
Used Chevrolet Corvette
174 Great Deals out of 17,468 listings starting at $3,000

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.