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 97 Riviera codes

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Joined : 2007-09-15
Post Count : 3
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PostSubject: 97 Riviera codes   Fri Jan 04, 2008 4:51 pm


There is two error codes that i dont know how to fix them:

P0102: MAF or VAF a ckt. Low Input - For this one, i chaged the MAF sensor twice, but there is still the same problem (on "D", the RPM goes down, not too much but you can feel it). I dont know why puzzled

P0420: Catalyst efficiency. I dont have catalyst converter anymore, when i bought the car, i had problems with it and i had to remove it.

If somebody knows how to fix them please let me know!!!!!!!

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Location : Finger Lakes of New York State
Joined : 2007-05-31
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PostSubject: Re: 97 Riviera codes   Fri Jan 04, 2008 5:42 pm

when was the last time you changed air filter, or did a tune-up? MAF is downstream of the air filter.

you say RPMs go down. I assume this is while cruising at steady speed. This is *normal* it is the transmission going into 'lockup' mode. Saves you gas.

To be street-legal you need a cat. The computer thinks you still have one and will 'yell' at you until you restore things to factory specs.

happy new year


Last edited by on Fri Jan 04, 2008 8:42 pm; edited 1 time in total
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Name : Aaron
Age : 40
Location : C-bus, Ohio
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PostSubject: Re: 97 Riviera codes   Fri Jan 04, 2008 6:35 pm

To fix the P0420, you can install an O2 emulator in place of the #2 (rear) O2 sensor. It costs $39.99:

'98 SC Riviera 281k miles 298 HP/370 TQ 0-60: 5.79s ET: 13.97 @ 99.28 4087 lb 20.1 avg MPG Nelson Ledges Lap: 1:30
3.4" pulley AL104 plugs 180 t-stat FWI w/K&N 1.9:1 rockers OR pushrods LS6 valve springs SLP headers ZZP fuel rails
KYB GR2 struts MaxAir shocks Addco sway bars UMI bushings GM STB Enkei 18" EV5s w/ Dunlop DZ101s F-body calipers
EBC bluestuff/Hawk HP plus SS lines Brembo slotted discs DHP tuned Aeroforce Hidden Hitch

^^^ SOLD ^^^ frown

'05 GTO 85k miles 0-60: 4.8s 16.9 avg MPG Nelson Ledges Lap: 1:26
Because fun

'70 Olds Ninety-Eight Holiday Coupe 116k miles 455 Rocket V8
Because cool

'95 Celica 152k miles 0-60: yes
Because free
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Name : Derek
Age : 46
Location : Reading, MA
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PostSubject: Re: 97 Riviera codes   Fri Jan 04, 2008 10:56 pm

That is the code I get when my MAF is unplugged. You'd have to connect a scanner to see what the MAF is reading as to why you are getting that code.
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Name : Matthew
Age : 31
Location : Florida
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PostSubject: Re: 97 Riviera codes   Sat Jan 05, 2008 2:55 pm

agree take a look at what the MAF values are.
did you clear the code after the new maf was installed?
the cat code can be "fixed" one of 3 ways.
1. put the cat back on
2. get a 02 sim (like Aaron said)
3. buy a PT and remove the code from the pcm

1996 with 254k miles, L324" FWI -> ported N* -> Ported Gen V w/3.0" Pulley, Stage 3 Phenolic I/C, ZZP FMHE, 1.84 RR, Headers and 3" pipe to mufflers, F-body brakes, and lowered on Eibachs. -RIP
AMG C400 White on black -daily
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