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Re: 1998 Buick Skylark Code P0420
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CarGuru > General Motors > Re: 1998 Buick Skylark Code P0420 6 October 2008 16:32:25
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Re: 1998 Buick Skylark Code P0420

Bobby12333 1 April 2005 23:49:50
 Hey Guy's
I took my 98 Buick Skylark to a reputable mechanic
& they kept it for two days checked everything with their sosfiscated
equipment & everything is
within specs & ECM tests were good. They turned off the MIL, road tested
it several miles with scanner attached & light did not come back on
everything looked normal so now they are scratching their heads also. I
had them check the plugs & wiring & the plugs are AC OEM & are the correct
ones for my car according to the owners manual & all parts that were
replaced on the 115K tuneup IE: Plugs, Plug wires Fuel filter, Serpentine
belt & Radiator hoses were purchased from a Carquest Parts Store & that is
the Parts Store that most of the independant garages use in my neck of the
woods. Some do use NAPA. Mechanic at this Garage gets all of his parts
from Carquest. Thankfully the Garage owner did not charge me anything
since they could not fix the problem. I feel sure that the MIL will come
back on again because it has haunted me so many times in the past few
months. The car runs perfectly gets 30+ miles to the gallon but it will
not pass inspection if the code P0420 sets again in my location. I have
pretty much exausted most of my alternatives & this is really frustrating.
I know this is a long message & I apologize but I wanted to try to explain
everything I could so someone out there might be able to help me. If
anyone has any suggestions they would be greatly appreciated. If I had
plenty of money I would probably light up a match & put this car out of
it's misery & give me some satisfaction. Thanks in advance for anyone who
can help!!

Robert Joyner

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Paul 2 April 2005 06:20:34 [ permanent link ]
 Bobby12333 wrote:>
Hey Guy's> I took my 98 Buick Skylark to a reputable mechanic> & they kept it for two days checked everything with their sosfiscated> equipment & everything is> within specs & ECM tests were good.

Post back with voltages for all the O2 sensors.
Add comment
Paul 2 April 2005 06:20:47 [ permanent link ]
 Post back with voltages for all the O2 sensors.
Add comment
Bobby12333 9 April 2005 18:35:16 [ permanent link ]
 Ken,
Thanks for the info. I did relay the situation to
the mechanic about the problem happening after filling up then the light
coming back on between
3/4 & 1/2 tank. With the situation with my car
I guess anything is possible. The mechanic will
keep & test drive the car as long as necessary to see if he can come up
with a solution. I have read & read on OBDII Forums & have not seen where
anyone else has encountered this exact problem. This is an interesting
problem & I intend to post back & let everyone know if the mechanic comes
up with a solution so it might help someone else in the future. Thanks to
everyone for your replys.
Robert Joyner

Add comment
Guest 6 October 2008 16:32:25 [ permanent link ]
 Buy an Actron Code reader or stop at advance auto parts and borrow theirs and reset the code. Then go through echeck and cross your fingers that it doesn't come on
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CarGuru > General Motors > Re: 1998 Buick Skylark Code P0420 6 October 2008 16:32:25
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