Question about 1991 Cadillac DeVille

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How do I find and change an 02 sensor on a 1991 Cadillac Deville 4.9 Liter engine

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  • Cadillac Master
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The Oxygen Sensor is located: Under hood, center, front engine area, above exhaust pipe flange, mounted in exhaust manifold
Application: Front

Under hood, center, rear engine area, above exhaust pipe flange, mounted in exhaust manifold
Application: Rear

I hope helps (remember to rate this). Good luck.

Posted on Oct 05, 2010

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Posted on Jan 02, 2017

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Nov 08, 2014 | 1991 Cadillac DeVille

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Tying to find crank sensor for 2002 Cadillac Seville std 4.6 liter


This answer covers 1999-2005 Cadillac Deville, Eldorado & Seville.
Example Engine:
2002 Cadillac Seville STS 4.6L SFI DOHC HO 8cyl.

This engine has (2) Crankshaft Position (CKP) Sensors: the Upper sensor is CKP sensor B, and the lower sensor is CKP sensor A (this is included for the OBD-II DTC codes - P0385 references Sensor B = upper CKP sensor, whereas P0335 references the lower CKP sensor (sensor A)).

Both crankshaft position sensors are located in the front of the engine just above the oil filter adapter. To access both CKP sensors, jack up vehicle on the passenger side, remove the oil filter, and the oil filter adapter, including the Engine Oil Pressure (EOP) switch. See illustration.
tying-find-crank-sensor-2002-cadillac-3hcuyyaerdphtgzyedxwn2k0-1-0.jpg
The ARROW points toward Front of Car.
1. Upper Crankshaft Position Sensor (B).
2. Lower Crankshaft Position Sensor (A)
3. Engine Oil Pressure (EOP) switch
4. Engine Oil Level switch
The Oil Filter is the can-type object below the oil filter adapter, which includes the EOP switch. Recommend: remove oil filter with an oil filter socket/strap wrench, since it's close to the oil pan.

Aug 21, 2014 | Cars & Trucks

1 Answer

I have changed the ecm in my 1991 cadillac deville and now the climate control and the fuel data system and the radio are blank need help!


The ecm,the last didget can't be under no more than 2 didgets or over 2 didgets if so the ecm is program for different sensors

Sep 14, 2013 | 1991 Cadillac DeVille

1 Answer

Firing order plug wires


Sorry for the delay. Check this for 1991 Cadillac DeVille 4.9 liter V-8 VIN "B"


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Hope helps (remember to rating this free answer).

Aug 17, 2011 | 1991 Cadillac DeVille

1 Answer

I HAVE 1995 CADILLAC DEVILLE IS IT FRONT WHEEL DRIVE OR REAR WHEEL , NEE TO CHANGE TO OIL PAN GASGET,AND THE RATIATOR,all could you tell me the engine size


your 8th digit of the serial number will tell you that. if it's 9 or Y = V8 4.6 liter, or if it's B = V8 4.9 liter

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02 deville crank sensor problem - diagnosed professionally


search ( mitchell1diy) this is a repair site you can access.

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I have a 1991 cadillac sedan deville and theauto


Check the fluid.Change the fluid and filter and see if it gets better.If it does then I would recommend a fluid transfer.This will transfer the old fluid and add new fluid.Hope this helps.Good luck.

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1991 cadillac deville fwd 4.9 engine shudders hard under slight acceleration. replaced plugs,wires,cap,rotor button,ignition module,egr valve, cleaned throttle body, still have same problem


I have a 1991 Cadillac Fleetwood 4.9 120000 miles, I have the same problem. replaced plugs,wires,cleaned throttle body, and O2 sensor and have same problem. Taking it to a GM shop on 02/24/10.

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Cadillac deville 1992 alarm problem and others


1989 1997 CADILLAC DEVILLE REPAIR MANUAL
You can simply get solution to your problem online here in this link

Nov 23, 2017 | 1991 Cadillac DeVille

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