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

8,935

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

35,005

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
    4,390
  • #2
    Tom Demyan
    Reputation
    2,990
  • #3
    munron
    Reputation
    2,430
View All

Related Models For Sale

Used Chevrolet Impala
517 Great Deals out of 34,033 listings starting at $950
Used Chevrolet Monte Carlo
12 Great Deals out of 1,299 listings starting at $2,500
Used Pontiac Bonneville
3 Great Deals out of 522 listings starting at $1,799
Used Pontiac Grand Am
1,062 listings starting at $1,899
Used Ford Mustang
692 Great Deals out of 37,626 listings starting at $895
Used Chevrolet Camaro
414 Great Deals out of 30,622 listings starting at $3,550
Used Chevrolet Malibu
1,038 Great Deals out of 70,417 listings starting at $2,499
Used Pontiac Firebird
12 Great Deals out of 777 listings starting at $4,300
Used Honda Accord
1,088 Great Deals out of 60,850 listings starting at $1,099

Used Cars For Sale

2008 Pontiac Grand Prix For Sale
16 Great Deals out of 406 listings starting at $1,491
2007 Pontiac Grand Prix For Sale
10 Great Deals out of 380 listings starting at $1,675
2006 Pontiac Grand Prix For Sale
470 listings starting at $3,995
2005 Pontiac Grand Prix For Sale
347 listings starting at $1,500

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.