Question about Cadillac DeVille

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Hey i have a 2000 cadillac deville dts and i just cant get it to idle smoothly. i cant figure out what it is.it says i need oxygen sensors you thaink thats why when i first crank it up it shuts right off? The scanner doesnt really give any codes. Please help i have to get this baby back up and running again.

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The oxygen sensor on the exhaust could be one. You will know where it is when you trace a cable down to the pipes of the exhaust. It could also be the air flow meter found at the intake. Make sure that there are no tears on the hose that leads from the air filter to the intake manifold. The wires may have come of on the sensor at the intake or a bad sensor.

Posted on Apr 04, 2011

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Posted on Jan 02, 2017

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2000 Cadillac Deville DTS 4.6L HO Northstar


Well, I don't think so. The pressure sensor will throw its own code (0450, 0451, 0452, 0453, or 0454). And likewise, the fuel level sender or sensor could also throw its own codes (P0460-P0464).

I'm not sure the level sensor and the pressure sensor are linked together. They are separate on a 2005 buick century, the pressure sensor being at the top of the tank located on the fuel pump module, but Cadillac: anything is possible.

Since you replaced the purge solenoid, there may be a problem in the circuit. The purge should have battery voltage to it with the key on. The ECM will ground the circuit internally when the purge is wanted. One symptom of a purge valve that isn't working or stuck closed can be a whooshing sound when the fuel tank cap is opened, indicating excessive pressure in the tank.
A shop's scan tool could be used to command the purge valve on to check it.

Sep 09, 2014 | 2000 Cadillac DeVille DTS

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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

2 Answers

Tuned up car changed 02 sensor full tank of fuel still running rough


Oxygen sensor only report the condition of the engine the rough running condition can range from a worn sparkplug wires to worn sparkplugs to valve problems to injector problems. with the cadillac deville a tune up should be the first attempt to smooth the rough idle with the inspection of the cap and rotor cap and rotor do have a tendancy to arc internally and create misfire so does sparkplug wire that can leak spark voltage to ground and create misfire. the spark plug wire especially if they are brittle and hard can create issues

Apr 23, 2011 | 1990 Cadillac Deville

1 Answer

How to remove air suspension pump?


Replacing your Cadillac DeVille DTS electronic shocks with these reliable non-electronic shocks is a simple installation procedure. Cadillac air suspension fails because of rubber dry rotting, and then leaking. Your air suspension compressor will eventually fail because of this. Cadillac shocks in the front fail because of the seals in the Cadillac shock wearing down over time. They eventually leak, losing its dampening ability needed for a safe and smooth ride. Try cadillac dealership for a little more info.

Apr 19, 2011 | 1998 Cadillac DeVille

1 Answer

I have 112,000 miles and my 2000 Deville check engine light just came on.


need to scan the computer to find out the area of problem.check engine lite tells you that something is wrong with fuel system ie.cat convertor ,coolant sensor,oxygen sensor,map or mass air flow sensor.need to scan.

Dec 21, 2010 | 2000 Cadillac DeVille

1 Answer

How to replace the tcc sensor in a 2001 cadillac deville dts


Any shop should be able to get that price for you. Service the trans and filter while its apart. Est $200.00

Nov 13, 2009 | 2006 Cadillac DTS

1 Answer

1993 cadillac deville 4.9 300ci. cars engine surges occasionally at random times only at low speeds. shut the car off and back on its fine. replaced fuel pump filter throttle sensor.


mcdevito75 Here, The air idle sensor / motor could be faulty, Oxygen sensor in the exhaust system could also be faukty, Have your shop run a scan.

Nov 02, 2009 | 1998 Cadillac DeVille

2 Answers

Does the air suspension automatically adjust after tires are off


i have a 2000 deville dts has a vibration driving down the highway have put new tires new axels new brakes nothing helps any solutions

Mar 01, 2009 | 2000 Cadillac DeVille

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