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Where are the 02 sensors on a 2002 Buick Lesabre 3.8L?

Car is running rough and OBD2 shows code for possibly the O2 sensors besides the spark plugs and/or coil packs

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  • Cars & Trucks Master
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The O2 sensors are in the exhaust. Your have up stream and down stream. The upstream is right behind the engine in the down pipe back by the firewall. The downstream sensor is under the car back by the catalytic converter.

Posted on Apr 21, 2013

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Posted on Jan 02, 2017

mrgreenz
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SOURCE: Possible o2 sensor 2002 GMC Onvoy

O2 sensors indicate unburned oxygen in the exhaust sysytem. Bad O2 sensors causes fuel mixture to run rich. It causes fuel consumption and your emmissions test will not pass. Check for vacuum leaks check the manifold.check for a misfiring cylinder, a burned exhaust valve that is leaking compression. replace the O2 sensor or sensors. Some cars have 2 . One for the intake another for the out take. If it reads a code for the Map sensor along with the O2. It is better ifyou replace both sensors. But I think that the problem lies in the oxygen sensor or sensors. Pleae vote my answer if this helps.

Posted on Jan 15, 2009

  • 58 Answers

SOURCE: 91 LEGACY STARTED RUNNING ROUGH

The cylinders are numbered as on the spark pack you changed. You might have done better putting the seafoam in the tank as an injector cleaner. Not sure why you changed so many parts, you seem to know how to get the codes from test connector lead hookup and the blink pattern. You might also want to check the fuel rail pressure and the crank and cam angle sensors. Before replacing the injector, swap the #4 injector with the adjacent one and see it the code moves with the injector or stays put. If the code stays on #4, then check the injector wiring, if it moves clean or replace the injector.

Posted on Mar 21, 2009

Molson02536
  • 3854 Answers

SOURCE: firing order from coil pack to spark plugs for

The firing order is 1-6-5-4-3-2  the engine from the passenger side to the drivers side, radiator side 1-3-5 and on the fire wall side 2-4-6
The 3 coil from the radiator to the fire wall. #1 coil 1-4 #2 coil 5-2 and coil #3 3-6 Good luck and keep me posted, be glad to help. Its harder to explain then show, hope i made sense. 

Posted on Jul 01, 2009

  • 25 Answers

SOURCE: I own a 2002 Chevy Trailblazer with 4200 vortec

Do you know if the plugs were changed, a bad or broken plug will also cause rough idle and slow acceleration?

Posted on Oct 21, 2009

  • 1 Answer

SOURCE: own a 1996 Grand AM GT 2.4 quad 4..manual...engine

engine missfire won't start

Posted on Dec 13, 2009

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2 Answers

Downstream O2 sensor


This indicates that the cylinder bank # 1 (bank where cylinder #1 is located) is running lean. You could have a vacuum leak even a slight leak can set this OBD2 fault code. The other possibility is that the sensor is defective. To check the sensors and see how they respond to rick and lean conditions you need to have a live data scanner (available on eBay) and monitor the O2 sensors while the engine is running, O2 sensor voltage will vary from about .2 volts (lean) to 1.0 volt (rich). Do not replace just one sensor replace them in pairs only. DO NOT THROW PARTS AT THIS AS YOU WILL WASTE ALLOT OF MONEY IF YOU ARE WRONG, DO THE TESTING.

Apr 06, 2016 | Buick Cars & Trucks

1 Answer

2002 Buick lesabre check engine light flashing and runs rough help


You have a misfire ,spark plug ,coil etc. .. the flashing check engine light is to warn you that the misfire is severe enough to damage the catalytic converter ! You need to take it to a repair right away ! A new catalytic converter can cost as much as $1,000 . The shop will check the code's in the PCM . this will tell them what cylinder is misfiring !

Apr 22, 2015 | 2002 Buick LeSabre

1 Answer

Trouble codes 93 buick lesabre


The first thing you have not checked is fuel pressure.
The pressure could be low, or the fuel filter could be clogged.
It takes more fuel to run the engine in the first 5 minutes until it warms up than under normal conditions.
The codes mean the sensors are not giving the computer the readings they should, but it does not always mean the sensors are faulty.
If the engine is running rough, or the fuel mixture is lean, the sensors will show that.
Code 44 is O2 sensor reading lean which may be true.
Code 33 is MAP sensor reading low vac which may also be true.
Another possible cause is the coolant temp sensor may not be telling the computer the right thing. If it tells the computer the coolant is 200 degrees and the engine is cold, you won't get enough fuel thru the injectors.

Feb 04, 2013 | 1993 Buick LeSabre

1 Answer

O2 sensor


the 02 sensors are in the exhaust system, screwed into exhaust like a spark plug. it is your upstream sensor. to change the sensors, first remove the wire to it, get a 02 sensor socket from the auto parts store. use the rachet and socket to take it out. good-day !

Apr 17, 2012 | 2003 Honda CR-V

1 Answer

My Buick Century has started to run a little rough and going through gas more. Besides just the spark plugs and tune up, what could the problem be? Seems as though there is interference with air flow.


running rough, could be a few possible things besides spark plugs, and wires!
air filter, fuel filter, fuel injectors, fuel pump, coil pack, Etc.
Id start with the air and fuel filters!
Good luck, Hope this helps!

Jan 21, 2011 | 2002 Buick Century

1 Answer

2002 Buick Lesabre codes P0131, P0171, and P1133.


Sounds like you just need to replace the one or two 02 sensors on bank 1.If you have over 100,000 miles the 02 sensos are realy to be replaced just as spark plugs and air filteres. If you wait to long to replace them you take a chance of them not comming out and then when they do go bad you will need to replace the exhaust as well.Hope this helps and good luck.

May 16, 2010 | 2002 Buick LeSabre

2 Answers

Obd2 code p0152 on 2001 Dakota


Oxygen Sensor
A code P0155 may mean that one or more of the following has happened:
  • O2 Heater element resistance is high
  • Internal short or open in the heater element
  • O2 heater circuit wiring high resistance
  • open or short to ground in the wiring harness
Possible Solutions
  • Repair short or open or high resistance in wiring harness or harness connectors
  • Replace oxygen sensor (cannot repair open or short that occurs internally to sensor)

Sep 10, 2009 | 2002 Dodge Intrepid

1 Answer

92 Buick Le Sabre engine stumbling/hesitation


Have you checked fuel pressure? How about spark on all 6 cylinders? Maybe a coil?

Apr 12, 2009 | 1992 Buick LeSabre

2 Answers

2002 chevy trailblazer has rough idle


it could be an o2 sensor. it could also just need a tune up

Mar 15, 2009 | 2002 Chevrolet TrailBlazer

1 Answer

I have a 91 buick lesabre and it jerks and drives rough at excess speeds of 45, the engine light comes on and i have replaced the coil pack and module, plugs wires and alternator, and throttle sensor, but...


could it possible be the o2 sensor check them out, they could clogging, and give the fuel injectors not enough of a pulse to get enough gas out for the ammount of o2

Feb 19, 2009 | 1991 Buick LeSabre

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