Question about 1996 Buick Roadmaster

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I have 2 catalytic converters on my 1996 Buick Roadmaster, I know 1 of them is bad. How can I tell which 1 it is so that I can buy the right one?

I had one of them replaced about 4 years ago, but I can't remember which one. Can the average person tell which one is bad?

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1 Answer

If one is bad you replace both
You have a 1996 bad or not their
over 14 years old so they get replaced
at that point,as they no longer are efficient
enough to process oxygen
You use the PO420 & PO430 codes you should
have as well as look at scan tool data,fuel trim,& back
probe & test the O2 Sensors.
If you hit them by hand when cold they may rattle
as the material inside is broken prosibly
Average person can not tell much,so no
Need experience & proper test equipment
Just replace both side & the front O2 sensors yourself

Posted on Jul 26, 2013

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Posted on Jan 02, 2017

  • 98 Answers

SOURCE: 1996 buick roadmaster keeps overheating:

A shotgun approach to repairs can really rack up the bills.

If your symptoms are loss of water and you have replaced the thermostat, you more than likely have an issue with steam. And that steam more than often comes from a bad head gasket. Most head gasket gasket failures seem to be confined to the water side initially, but let it go on bigger damage will occur.
You can buy a litmus test strip to dunk in the coolant. It will indicate if there are exhaust residuals in the water and thus a gasket failure.

However it may just be something simple, given that you have just about replaced everything:

have you given the radiator a good hosing inside and out?
is the radiator fan running when it should be?

Posted on Sep 07, 2008

  • 4 Answers

SOURCE: 1996 buick roadmaster

what is the problem??

Posted on Nov 03, 2008

SOURCE: i need to change my fuel filter on my 1996 buick roadmaster

thank you very much for the help i changed it out fine. it turned out not to be the problem but it needed changed out anyway. it turned out to be the fuel pump relay. thanks for the help

Posted on Nov 03, 2008

  • 3 Answers

SOURCE: catalytic converter,1990 buick le sabre

The Catalytic Converter is part of the muffler system, and can be found between the rear of the engine and before the muffler on the exhaust system.

Posted on Dec 12, 2008

  • 6982 Answers

SOURCE: 1996 Buick Roadmaster rough start sputters and

Check the mass air flow sensor (clean both heated wires with carb cleaner and Q-tip). Remember...cleaning does not always work...sometimes they are actually bad. Also check map sensor. Check for vacuum leaks at all hoses and fittings. If engine rpm drops sufficiently, engine vacuum will drop which may have caused a/c malfunction (controls work with vacuum signal) so I wouldn't worry about that 'till the run problem is dealt with.

Posted on Jul 30, 2009

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1 Answer

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2 Answers

1996 buick roadmaster keeps overheating: already replaced the thermostat, water pump, heater core, heater control valve, hoses and anti-freeze


A shotgun approach to repairs can really rack up the bills.

If your symptoms are loss of water and you have replaced the thermostat, you more than likely have an issue with steam. And that steam more than often comes from a bad head gasket. Most head gasket gasket failures seem to be confined to the water side initially, but let it go on bigger damage will occur.
You can buy a litmus test strip to dunk in the coolant. It will indicate if there are exhaust residuals in the water and thus a gasket failure.

However it may just be something simple, given that you have just about replaced everything:

have you given the radiator a good hosing inside and out?
is the radiator fan running when it should be?

Sep 07, 2008 | 1996 Buick Roadmaster

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