Any suggestions for code P0420 & P1404 for a 3.8L?

245

Asked by Oct 20, 2012 at 11:20 PM about the 2002 Pontiac Grand Prix GT Coupe

Question type: Maintenance & Repair

Is an EGR Valve on a 3.8L difficult to clean or remove & replace?  Most likely I will have to have a mechanic replace my Catalytic Converter.  Is it best to purchase the Universal Catalytic Converter in which the mechanic would then cut the old one out & replace with the new one vs purchasing the whole unit which consists of the piping to the engine & the piping to the resonator with the cat in the middle, the pricing is different however.

2 Answers

9,145

P0420 CATALYTIC CONVERTER!!!!!!!!!!!!! the prices are extremely different, most people go with the universal cats estimating $100-$200, and last about one year.....the dealer should be triple that (again guessing), but warranted for 8 years. call or price around local exhaust shops, usually just cut off the cat. itself, and reweld the universal in.If your car has 2 cats...some do. then you would have to either figure out which cat it was, (by the po420 code, then using the scan tool, the mechanic would read the sensor readings, to decide which are the bad ones, and determine the cat. EGR, fairly simple, but your level of experience determines if you break the thin dried plastic crap clips located around you in the engine bay", let me know if i helped, or can help more,. thanks

35,945

Its OBD2 DO NOT put a universal cat on it. It will last 6 months to a year and within that time it will clog the exhaust causing you to have to replace it again because you will have no power. It doesn't have the correct catalysts in it so it will destroy itself. Buy correct cat from a parts store and have a local shop put it in.

3 of 3 people found this helpful.

Your Answer

Pontiac Grand Prix Experts

  • #1
    Js08016
    Reputation
    4,470
  • #2
    Tom Demyan
    Reputation
    3,120
  • #3
    munron
    Reputation
    2,550
View All

Related Models For Sale

Used Chevrolet Impala
540 Great Deals out of 33,339 listings starting at $1,499
Used Pontiac Bonneville
438 listings starting at $1,500
Used Chevrolet Malibu
1,090 Great Deals out of 57,678 listings starting at $995
Used Chevrolet Monte Carlo
7 Great Deals out of 1,237 listings starting at $1,125
Used Ford Mustang
454 Great Deals out of 42,976 listings starting at $1,488
Used Pontiac Grand Am
955 listings starting at $2,489
Used Chevrolet Camaro
510 Great Deals out of 31,319 listings starting at $2,495
Used Nissan Maxima
355 Great Deals out of 20,947 listings starting at $1,175
Used Pontiac Firebird
6 Great Deals out of 740 listings starting at $3,988
Used Buick Regal
145 Great Deals out of 6,578 listings starting at $3,995

Used Cars For Sale

2008 Pontiac Grand Prix For Sale
5 Great Deals out of 396 listings starting at $2,500
2007 Pontiac Grand Prix For Sale
3 Great Deals out of 342 listings starting at $2,400
2006 Pontiac Grand Prix For Sale
428 listings starting at $1,988
2005 Pontiac Grand Prix For Sale
4 Great Deals out of 337 listings starting at $950

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.