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Does anyone know how many catalytic converters a 2001 Cadillac Deville has on it?

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bill mcmurray

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Single exhaust 1,dual exhaust 2

Posted on Oct 30, 2013


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2003 DeVille. Cranks and seems to idle normally. When trying to drive it will not accelerate and seems to choke back. Someone has suggested the catalytic converter needs replacement.

Before you replace your catalytic converter, you can disconnect it and take if for a drive. If the problem goes away, you know you may have a bad component. If the problem is still present, might have other problems.

Nov 27, 2016 | 2003 Cadillac Deville

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How many 02 sensors does a 2001 Cadillac deville have

4 total. 1 each manifold. Then 1 before, 1 after the CAT. You should be able to count and trace them from the connections on the top of your engine. Good luck

Feb 23, 2015 | Cadillac DeVille Cars & Trucks

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What is the part number for 02 oxygen sensor bank 1 sensor 3 on 1999 sts cadillac

OEM Part Number(s): 19178928, 25161131, 25312197 replacements: (1A AUTO)1AEOS00163 or Walker WKEOS00092-02

Bank 1 Sensor 3 ,Sensor number #3 is downstream (after) the Catalytic Converter. There are also 2 upstream sensors Left or Front
#1 and Right or Rear #2 upstream sensors.

Jul 03, 2014 | 2001 Cadillac DeVille

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How to replace H02 heater control circuit bank1 sensor2 on 01 cadillac deville

Normally just replace the HO2S sensor using the correct tool for the job so as not to damage the wiring to the unit as it is wired directly to the ECM unit.

Feb 09, 2014 | 2001 Cadillac DeVille

1 Answer

2001 Cadillac diagnostic intermittent code points to catalytic converter but car rides smooth. no indication of problem with catalytic converter.

the problem could be that the convertor is no longer doing its job of reducing the emmissions which you wouldn`t notice any performance problems with the drivability of the should have a convertor efficency test done to the convertor to eliminate or prove the could also be an o2 problem that you should be put on a scan tool to see what the readings are while the car is driven.this may help in finding the problem

Oct 17, 2011 | 2001 Cadillac DeVille

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My 2000 Cadillac Deville engine light on. Engine code PO420

Catalyst System Efficiency Below Threshold (Bank 1)

A code PO420 may mean that one or more of the following has happened:
  • Leaded fuel was used where unleaded was called for
  • An oxygen sensor is not reading (functioning) properly
  • The engine coolant temperature sensor is not working properly
  • Damaged or leaking exhaust manifold / catalytic converter / exhaust pipe
  • Retarded spark timing
  • The oxygen sensors in front and behind the converter are reporting too similar of reading

  • Check for exhaust leaks at the manifold, pipes, catalytic converter. Repair as required.
  • Use a scope to diagnose the oxygen sensor operation (Tip: The oxygen sensor in front of the catalytic converter normally has a fluctuating waveform. The waveform of the sensor behind the converter should be more steady).
  • Inspect the downstream heated oxygen sensor (HO2), replace if necessary
  • Replace the catalytic converter

May 11, 2011 | 2000 Cadillac DeVille

1 Answer

What to do about A 2001 Cadillac deville Code P0420, Catalyst Efficiency below threshold??

Hello, If you have a code P0420 the only way to correct it is to replace the catalytic converter. Sorry.

Oct 05, 2010 | Cadillac DeVille Cars & Trucks

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I have a Cadillac Sedan Deville 2001 that will not pass emissions even though a new catalytic converter was put in and 2 new computers. The mechanic is saying that the computer isn't resetting which is...

You might have to go to a Cadillac dealership to get it reset. Some sections of the computer are locked out so only the manufacturer can fix it.

Jan 15, 2018 | 2001 Cadillac DeVille

2 Answers

How many front 02 sensors does a 2000 cad deville have?

There will be two primary O2 sensors, one on each exhaust manifold (one for each bank of cylinders in the engine). There will also be one behind each catalytic converter (used for assessing how well the cat is functioning).

May 06, 2009 | 2001 Cadillac DeVille

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