Where is the oxygen sensor on a 2001 cadillac deville

Re: Replacing O2 sensor - Cadillac Forums

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Dec 28, 2009 - 14 posts - ‎3 authors
Hi guys, my wife has a 99 Deville with the 4.6L Northstar engine. ... I used the search function for "oxygen sensors" but I received a ton of ... 1985-1992 Fleetwood, 1993Sixty Special, All FWD Forum Discussion, Replacing O2 ... Re: 1992 Deville O2 sensor location
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Cadillac DeVille Oxygen Sensor - PartsGeek.com

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.

Why do you need a wiring diagram for a O2 Sensor? They are 4 wires and when you replace the sensor, you get a OEM. If you are going to get a Universal, it comes with a wiring diagram (GREY go to WHITE) and Black to Black

there is 4 on the 1996 cadillac deville which one do you need

Bank 1 is the side with the #1 cylinder, In your car it is the bank that is nearest the firewall. Sensor 1 will be the one BEFORE the catalytic convertor, or nearest the engine in the exhaust manifold or pipe.

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

these are trouble codes indicating -171-bank 1,174-bank2, both sides of the engine are to lean, many causes and extensive diagnosis procedures. low fuel pressure seems primary,leaking vacumn hoses, incorrect oxygen sensor readings,gas in the oil,and many other problems.if you are determined to fix this yourself you can go to mitchellonline and pay for short term use of their service info. very extensive.guess work not advised.

Change the oxygen sensor on bank 1, not the one down by the cat converter, the one toward the top of the engine.

it should take approximately 4 - 5 hours plus the cost of sensor

hi im wesall o2 sensors are located in the exaust system yours has one before the converter one after if it has duall exaust before the cat on drivers side will be upstream sensor bank 1 after cat right side will be bank 2 sensor 2
thanks wes
ps please rate me